Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
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