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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification, net | $ 52 | $ 34 | $ 145 | $ (19)
Interest expense, net | 28,238 | 49,079 | 84,622 | 144,041
Cost of goods sold | 319,703 | 289,270 | 934,088 | 821,342
Income (loss) before income taxes and noncontrolling interest | (22,906) | (2,156) | (52,741) | 1,732
Tax expense (benefit) | 8,470 | 5,172 | 21,590 | 5,269
Net loss | (14,436) | 3,016 | (31,151) | 7,001
Defined benefit and other postretirement plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification, before tax | (38) | (38) | (74) | (116)
Reclassification, tax | 13 | 6 | 19 | 19
Reclassification, net | (25) | (32) | (55) | (97)
Amortization of prior service credit |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification, before tax | (40) | (19) | (79) | (58)
Amortization of net (gain) loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification, before tax | 2 | (19) | 5 | (58)
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 | 101 | 107 | 265 | 126
Tax expense (benefit) | (24) | (41) | (65) | (48)
Net loss | 77 | 66 | 200 | 78
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 | 71 | 13 | 164 | 22
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 | $ 30 | $ 94 | $ 101 | $ 104

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