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v3.6.0.2

Segment Reporting (Details 3) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) trading_counterparty | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | $ 662,497 | $ 639,236 | $ 632,526
Dore [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of Trading Counterparties | trading_counterparty | 11 |  |
Smelting and Refining [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of Trading Counterparties | trading_counterparty | 2 |  |
Sales [Member] | Dore [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration Risk, Percentage | 77.00% | 74.00% | 63.00%
Sales [Member] | Smelting and Refining [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration Risk, Percentage | 23.00% | 26.00% | 37.00%
Mitsui & Co. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | $ 0 | $ 137,700 | $ 133,800
China National Gold [Domain] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 126,600 | 126,200 | 86,800
Ohio Precious Metals [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 98,400 | 37,300 | 8,300
Republic Metals Corporation [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 93,300 | 47,700 | 4,000
Asahi Formerly Johnson Matthey [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 62,600 | 84,200 | 71,800
Standard Bank [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 29,000 | 34,700 | 87,500
TD Securities [Domain] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 15,500 | 81,300 | 106,700
INTL Commodities [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | $ 76,700 | $ 33,100 | $ 22,400

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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