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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income (loss) $ (56,112) $ 50,405 $ (16,230) $ 50,645
Other comprehensive income (loss) before income tax effect:        
Net gain on foreign currency cash flow hedges reclassified as income (46) (46) (139) (139)
Defined benefit plans and other postretirement benefits:        
Net gain (loss) arising during the period (4,115) 0 12,145 440
Prior service benefit arising during the period 0 0 1,782 0
Amortization of prior service benefit during the period (979) (952) (2,846) (2,856)
Amortization of net loss during the period 1,899 1,402 6,022 4,207
Other comprehensive income (loss) income before income tax effect (3,241) 404 16,964 1,652
Income tax effect (383) (557) (1,148) (1,837)
Other comprehensive income (loss) (3,624) (153) 15,816 (185)
Total comprehensive income (loss) $ (59,736) $ 50,252 $ (414) $ 50,460