Quarterly report pursuant to Section 13 or 15(d)

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

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Derivative Instruments and Hedging Transactions (Hedging of Precious Metals Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Derivatives, Fair Value [Line Items]    
Inventory $ 372,198 $ 292,861
Precious metals held under financing arrangements 200,809 208,792
Inventory and precious metals held under financing arrangements 573,007 501,653
Commemorative coin inventory, held at lower of cost or net realizable value (2,336) (17)
Premium on metals position (5,276) (4,424)
Precious metal value not hedged (7,612) (4,441)
Subtotal 565,395 497,212
Commitments at market:    
Open inventory purchase commitments 285,267 166,600
Open inventory sales commitments (236,353) (158,870)
Margin sale commitments (10,048) (11,652)
In-transit inventory no longer subject to market risk (3,802) (809)
Unhedgeable premiums on open commitment positions 2,014 838
Borrowed precious metals (196,738) (201,144)
Product financing arrangements (159,130) (94,505)
Advances on industrial metals 9,512 8,644
Commitments at market (309,278) (290,898)
Precious metal subject to price risk 256,117 206,314
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 257,349 205,830
Net precious metals subject to commodity price risk (1,232) 484
Precious metals forward contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments 118,988 133,612
Precious metals futures contracts at market values    
Precious metal subject to derivative financial instruments:    
Market value of derivative financial instruments $ 138,361 $ 72,218