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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income (loss) $ (16,163) $ 73,779
Other comprehensive income (loss) before income tax effect:    
Net gain on foreign currency cash flow hedges reclassified as income (46) (47)
Defined benefit plans and other postretirement benefits:    
Amortization of prior service benefit during the period (667) (936)
Amortization of actuarial net loss during the period 1,919 1,444
Other comprehensive income before income tax effect 1,206 461
Income tax effect (383) (383)
Other comprehensive income 823 78
Total comprehensive income (loss) $ (15,340) $ 73,857