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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other expense, net                 $ 2,098 $ (11,077) $ (24,364)
Interest expense, net                 (111,525) (113,723) (179,044)
Cost of goods sold                 (1,176,550) (1,226,520) (1,095,265)
Income before income taxes an noncontrolling interest                 121,009 88,616 (60,634)
Tax benefit (expense)                 (40,699) (28,995) 119,197
Net income $ 19,331 $ 26,819 $ 30,719 $ 3,441 $ 28,470 $ 14,436 $ 16,159 $ 556 80,310 59,621 $ 58,563
Amount of gain (loss) reclassified from AOCI into income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income                 (656) 157  
Defined benefit and other postretirement plans | Amount of gain (loss) reclassified from AOCI into income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income before income taxes an noncontrolling interest                 112 100  
Tax benefit (expense)                 (45) (16)  
Net income                 67 84  
Prior service credit (cost) | Amount of gain (loss) reclassified from AOCI into income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other expense, net                 133 112  
Actuarial gains (losses) | Amount of gain (loss) reclassified from AOCI into income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other expense, net                 (21) (12)  
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 before income taxes an noncontrolling interest                 (960) 97  
Tax benefit (expense)                 237 (24)  
Net income                 (723) 73  
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                 (625) (256)  
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                 $ (335) $ 353