Quarterly report pursuant to Section 13 or 15(d)

Inventories (Narrative) (Details)

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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Inventory [Line Items]    
Inventory held for sale $ 169,457 $ 185,699
Repurchase arrangements with customers 91,000 92,300
Consignment arrangements with customers 5,900 8,000
Commemorative coins, held at lower of cost or market 34 16
Borrowed precious metals from suppliers 3,500 4,400
Product financing arrangement, restricted 121,500 59,400
Unrealized gains (losses) included in inventory balance (8,400) 12,700
Premium on metals position 5,718 4,627
Inventory held for sale    
Inventory [Line Items]    
Inventory held for sale $ 69,054 $ 81,006