Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details)

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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification, net                 $ (157) $ 100  
Interest expense, net                 113,723 179,044 $ 140,315
Cost of goods sold                 1,226,520 1,095,265 810,085
Income (loss) before income taxes and noncontrolling interest                 (88,616) 60,634 69,117
Tax (expense) benefit                 28,995 (119,197) 10,041
Net (income) loss $ (28,470) $ (14,436) $ (16,159) $ (556) $ (65,564) $ 3,016 $ 1,670 $ 2,315 (59,621) (58,563) $ 79,158
Defined benefit and other postretirement plans                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification, before tax                 (100) (132)  
Reclassification, tax                 16 25  
Reclassification, net                 (84) (107)  
Amortization of prior service cost                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification, before tax                 (112) (78)  
Amortization of net gain (loss)                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification, before tax                 12 (54)  
Net gain (loss) from hedging activities | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) before income taxes and noncontrolling interest                 (97) 262  
Tax (expense) benefit                 24 (55)  
Net (income) loss                 (73) 207  
Net gain (loss) from hedging activities | Reclassification out of Accumulated Other Comprehensive Income | Interest rate caps                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense, net                 256 40  
Net gain (loss) from hedging activities | Reclassification out of Accumulated Other Comprehensive Income | Natural gas swaps                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Cost of goods sold                 $ (353) $ 222