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Equity Method Investments - Operating Results (Details) - ICP [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net sales | $ 40,576 | $ 48,371 | $ 90,185 | $ 87,969
Cost of sales and expenses | 36,980 | 37,609 | 84,866 | 72,779
Net income | $ 3,596 | $ 10,762 | $ 5,319 | $ 15,190

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