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Segment Reporting - Summary of Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 143,855 | $ 148,795 | $ 169,987 | $ 163,267 | $ 214,585 | $ 159,919 | $ 149,540 | $ 185,554 | $ 625,904 | $ 709,598 | $ 571,897
Customer Concentration Risk [Member] | Asahi Formerly Johnson Matthey [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 213,000 | 124,100 | 62,600
Customer Concentration Risk [Member] | Techemet Metal Trading [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 83,300 | 104,800 | 40,700
Customer Concentration Risk [Member] | Ocean Partners [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 74,800 | 0 | 0
Customer Concentration Risk [Member] | RMC [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71,700 | 132,400 | 47,300
Customer Concentration Risk [Member] | China National Gold [Domain] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 54,100 | 137,500 | 126,600
Customer Concentration Risk [Member] | INTL Commodities [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 0 | $ 9,600 | $ 76,600

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