Quarterly report pursuant to Section 13 or 15(d)

Hedging Transactions (Hedging of Precious Metals Inventory) (Details)

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Hedging Transactions (Hedging of Precious Metals Inventory) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Derivatives, Fair Value [Line Items]    
Inventory $ 159,240 $ 175,554
Commemorative coin inventory, held at lower of cost or market (816) (2,564)
Premium on metals position (2,778) (3,285)
Inventory value not hedged (3,594) (5,849)
Subtotal 155,646 169,705
Commitments at market    
Open inventory purchase commitments 429,522 489,944
Open inventory sales commitments (145,283) (190,108)
Margin sale commitments (10,610) (15,751)
In-transit inventory no longer subject to market risk (34,993) (4,522)
Unhedgable premiums on open commitment positions 271 1,694
Inventory borrowed from suppliers (11,998) (8,709)
Product financing obligation (20,613) (24,610)
Advances on industrial metals 1,915 8,813
Inventory subject to price risk 363,857 426,456
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 363,801 427,039
Net inventory subject to price risk 56 (583)
Precious metals forward contracts at market values
    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 158,770 206,055
Precious metals futures contracts at market values
    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments $ 205,031 $ 220,984