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Equity Method Investments - Operating Results (Details) - ICP [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Net sales | $ 177,401 | $ 166,905 | $ 236,486
Cost of sales and expenses | (163,837) | (146,098) | (196,551)
Net income | $ 13,564 | $ 20,807 | $ 39,935

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