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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income (loss) $ (33,897) $ 20,344 $ 39,882 $ 240
Other comprehensive income before income tax effect:        
Net gain on foreign currency cash flow hedges reclassified as income (46) (47) (93) (93)
Defined benefit plans and other postretirement benefits:        
Net gain arising during the period 16,260 440 16,260 440
Prior service benefit arising during the period 1,782 0 1,782 0
Amortization of prior service benefit during the period (931) (952) (1,867) (1,904)
Amortization of net loss during the period 2,679 995 4,123 2,805
Other comprehensive income before income tax effect 19,744 436 20,205 1,248
Income tax effect (382) (567) (765) (1,280)
Other comprehensive income (loss) 19,362 (131) 19,440 (32)
Total comprehensive income (loss) $ (14,535) $ 20,213 $ 59,322 $ 208