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
Dec. 31, 2019
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 5,359 $ 2,428
Derivative liabilities 9,049 9,971
Fair Value on a Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 261,533 292,844
Precious metals held under financing arrangements 196,972 208,792
Total assets valued at fair value 463,864 504,064
Liabilities on borrowed metals 192,889 201,144
Product financing arrangements 79,766 94,505
Total liabilities, valued at fair value 281,704 305,620
Fair Value on a Recurring Basis | Liability on price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 2 22
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 3,618 2,981
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 2,589 3,822
Fair Value on a Recurring Basis | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 2,840 1,241
Fair Value on a Recurring Basis | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities   1,905
Fair Value on a Recurring Basis | Open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4,950 2,322
Fair Value on a Recurring Basis | Option contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1 61
Fair Value on a Recurring Basis | Future contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 60 2
Fair Value on a Recurring Basis | Forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 348 43
Fair Value on a Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 261,533 292,844
Precious metals held under financing arrangements 196,972 208,792
Total assets valued at fair value 463,864 504,064
Liabilities on borrowed metals 192,889 201,144
Product financing arrangements 79,766 94,505
Total liabilities, valued at fair value 281,702 305,598
Fair Value on a Recurring Basis | Level 1 | Liability on 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 3,618 2,981
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 2,589 3,822
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 2,840 1,241
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   1,905
Fair Value on a Recurring Basis | Level 1 | Open sale and purchase commitments, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4,950 2,322
Fair Value on a Recurring Basis | Level 1 | Option contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1 61
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 60 2
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 348 43
Fair Value on a Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0 0
Precious metals held under financing arrangements 0 0
Total assets valued at fair value 0 0
Liabilities on borrowed metals 0 0
Product financing arrangements 0 0
Total liabilities, valued at fair value 0 0
Fair Value on a Recurring Basis | Level 2 | Liability on 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 | Future contracts    
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 | 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 | Option 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 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 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0 0
Precious metals held under financing arrangements 0 0
Total assets valued at fair value 0 0
Liabilities on borrowed metals 0 0
Product financing arrangements 0 0
Total liabilities, valued at fair value 2 22
Fair Value on a Recurring Basis | Level 3 | Liability on price protection programs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 2 22
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 | Future contracts    
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 | 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 | Option 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
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