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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 48,580 $ (252,415) $ (59,310)
Other comprehensive income (loss) before income tax effect:      
Foreign currency cash flow hedges reclassified to net income (loss) (186) 4,295 (186)
Defined benefit plans and other postretirement benefits:      
Net gain (loss) arising during the period (7,192) (9,522) 5,553
Prior service benefit arising during the period 27,396 0 1,758
Amortization of prior service benefit during the period (4,950) (2,675) (8,351)
Amortization of net loss during the period 8,610 8,190 7,794
Other comprehensive income (loss) before income tax effect 23,678 288 6,568
Income tax effect (1,527) (1,531) (1,536)
Other comprehensive income (loss) 22,151 (1,243) 5,032
Total comprehensive income (loss) $ 70,731 $ (253,658) $ (54,278)