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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification, net | $ 9 | $ 49
Interest expense, net | 29,163 | 46,785
Cost of goods sold | 288,076 | 250,219
Income (loss) before income taxes and noncontrolling interest | (27) | 5,225
Tax (expense) benefit | (529) | (2,910)
Net loss | (556) | 2,315
Defined benefit and other postretirement plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification, before tax | 17 | 39
Reclassification, tax | (3) | (6)
Reclassification, net | 14 | 33
Amortization of prior service cost |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification, before tax | 19 | 20
Amortization of net gain (loss) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassification, before tax | (2) | 19
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income (loss) before income taxes and noncontrolling interest | (7) | 16
Tax (expense) benefit | 2 | 0
Net loss | (5) | 16
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income | Interest rate caps |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense, net | (35) | (2)
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income | Natural gas swaps |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Cost of goods sold | $ 28 | $ 18

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