Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Derivative Instrument and Hedging Transactions (Hedging of Precious Metals Inventory) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Derivatives, Fair Value [Line Items]    
Inventory $ 245,057 $ 191,501
Commemorative coin inventory, held at lower of cost or market (16) (1,518)
Premium on metals position (4,627) (3,255)
Inventory value not hedged (4,643) (4,773)
Subtotal 240,414 186,728
Commitments at market:    
Open inventory purchase commitments 550,810 444,023
Open inventory sales commitments (237,325) (249,081)
Margin sale commitments (12,439) (12,430)
In-transit inventory no longer subject to market risk (7,363) (13,807)
Unhedgable premiums on open commitment positions 400 528
Inventory borrowed from suppliers (4,352) (9,500)
Product financing arrangements (59,358) (39,425)
Advances on industrial metals 4,521 3,340
Inventory subject to price risk 475,308 310,376
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 474,979 310,316
Net inventory subject to commodity price risk 329 60
Precious metals forward contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments 188,530 202,323
Precious metals futures contracts at market values    
Inventory subject to derivative financial instruments    
Market value of derivative financial instruments $ 286,449 $ 107,993