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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (59,310) $ 126,474 $ (40,313)
Other comprehensive income (loss) before income tax effect:      
Net gain on foreign currency cash flow hedges reclassified as income (186) (186) (186)
Defined benefit plans and other postretirement benefits:      
Net gain (loss) arising during the period 5,553 (41,995) 56,795
Prior service benefit (cost) arising during the period 1,758 (1,299) 0
Amortization of prior service benefit during the period (8,351) (3,504) (3,920)
Amortization of actuarial net loss during the period 7,794 10,312 8,174
Change in equity in investee other comprehensive income 0 0 61
Other comprehensive income (loss) before income tax effect 6,568 (36,672) 60,924
Income tax effect (1,536) (1,829) (1,564)
Other comprehensive income (loss) 5,032 (38,501) 59,360
Total comprehensive income (loss) $ (54,278) $ 87,973 $ 19,047