Quarterly report pursuant to Section 13 or 15(d)

Derivative Instrument and Hedging Transactions (Hedging of Precious Metals Inventory) (Details)

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Derivative Instrument and Hedging Transactions (Hedging of Precious Metals Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Derivatives, Fair Value [Line Items]    
Inventory $ 254,506 $ 191,501
Commemorative coin inventory, held at lower of cost or market (163) (1,518)
Premium on metals position (3,529) (3,255)
Inventory value not hedged (3,692) (4,773)
Subtotal 250,814 186,728
Commitments at market    
Open inventory purchase commitments 556,388 444,023
Open inventory sales commitments (477,089) (249,081)
Margin sale commitments (11,436) (12,430)
In-transit inventory no longer subject to market risk (16,625) (13,807)
Unhedgable premiums on open commitment positions 6,356 528
Inventory borrowed from suppliers (4,009) (9,500)
Product financing obligation (50,030) (39,425)
Advances on industrial metals 3,709 3,340
Inventory subject to price risk 258,078 310,376
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 258,025 310,316
Net inventory subject to commodity price risk 53 60
Precious metals forward contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 123,658 202,323
Precious metals futures contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments $ 134,367 $ 107,993