Quarterly report pursuant to Section 13 or 15(d)

Inventories (Narrative) (Details)

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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Inventory [Line Items]      
Inventory held for sale $ 186,720   $ 149,316
Repurchase arrangements with customers 105,000   92,500
Consignment arrangements with customers 7,800   7,400
Commemorative coins, held at lower of cost or market 215   40
Borrowed precious metals from suppliers 15,000   5,600
Product financing arrangement, restricted 124,900   135,300
Unrealized gains (losses) included in inventory balance (3,000) $ (4,500)  
Premium on metals position 4,129   4,088
Inventory held for sale      
Inventory [Line Items]      
Inventory held for sale $ 58,746   $ 43,787