Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities, at Fair Value (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details)

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Assets and Liabilities, at Fair Value (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 2,706 $ 7,395
Derivative liabilities 35,974 20,457
Fair Value on a Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 289,719 280,017
Precious metals held under financing arrangements 232,476 262,566
Total assets valued at fair value 524,901 549,978
Liability on borrowed metals 227,198 280,346
Product financing arrangements 53,126 113,940
Contingent earn-out liability 588 588
Total liabilities, valued at fair value 316,886 415,331
Fair Value on a Recurring Basis | Liability of price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 116 168
Fair Value on a Recurring Basis | Liability on margin accounts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 3,728 3,804
Fair Value on a Recurring Basis | Open sale and purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 25,488 16,485
Fair Value on a Recurring Basis | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 4,479  
Fair Value on a Recurring Basis | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 2,163  
Fair Value on a Recurring Basis | Derivative assets — open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1,981 2,274
Fair Value on a Recurring Basis | Options Held    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 392 390
Fair Value on a Recurring Basis | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 193 4,493
Fair Value on a Recurring Basis | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 140 238
Fair Value on a Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 289,719 280,017
Precious metals held under financing arrangements 232,476 262,566
Total assets valued at fair value 524,901 549,978
Liability on borrowed metals 227,198 280,346
Product financing arrangements 53,126 113,940
Contingent earn-out liability 0 0
Total liabilities, valued at fair value 316,182 414,575
Fair Value on a Recurring Basis | Level 1 | Liability of price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 1 | Liability on margin accounts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 3,728 3,804
Fair Value on a Recurring Basis | Level 1 | Open sale and purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 25,488 16,485
Fair Value on a Recurring Basis | Level 1 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 4,479  
Fair Value on a Recurring Basis | Level 1 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 2,163  
Fair Value on a Recurring Basis | Level 1 | Derivative assets — open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1,981 2,274
Fair Value on a Recurring Basis | Level 1 | Options Held    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 392 390
Fair Value on a Recurring Basis | Level 1 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 193 4,493
Fair Value on a Recurring Basis | Level 1 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 140 238
Fair Value on a Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 0 0
Precious metals held under financing arrangements   0
Total assets valued at fair value 0 0
Liability on borrowed metals 0 0
Product financing arrangements 0 0
Contingent earn-out liability 0 0
Total liabilities, valued at fair value 0 0
Fair Value on a Recurring Basis | Level 2 | Liability of price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 2 | Liability on margin accounts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 2 | Open sale and purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 2 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Fair Value on a Recurring Basis | Level 2 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Fair Value on a Recurring Basis | Level 2 | Derivative assets — open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 2 | Options Held    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 2 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 2 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 0 0
Precious metals held under financing arrangements   0
Total assets valued at fair value 0 0
Liability on borrowed metals 0 0
Product financing arrangements 0 0
Contingent earn-out liability 588 588
Total liabilities, valued at fair value 704 756
Fair Value on a Recurring Basis | Level 3 | Liability of price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 116 168
Fair Value on a Recurring Basis | Level 3 | Liability on margin accounts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 3 | Open sale and purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Fair Value on a Recurring Basis | Level 3 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Fair Value on a Recurring Basis | Level 3 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Fair Value on a Recurring Basis | Level 3 | Derivative assets — open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 3 | Options Held    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 3 | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Fair Value on a Recurring Basis | Level 3 | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 0 $ 0