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Equity Method Investments - Operating Results (Details) - ICP - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
ICP’s Operating results: |  |  |  |
Net sales | $ 39,677 | $ 40,576 | $ 78,062 | $ 90,185
Cost of sales and expenses | 42,410 | 36,980 | 79,224 | 84,866
Net income | $ (2,733) | $ 3,596 | $ (1,162) | $ 5,319

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