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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Comprehensive loss:    
Net loss $ (15,139) $ (16,163)
Other comprehensive income (loss) before income tax effect:    
Net loss on foreign currency cash flow hedges reclassified as income (46) (46)
Defined benefit plans and other postretirement benefits:    
Amortization of prior service benefit during the period (311) (667)
Amortization of net loss during the period 2,143 1,919
Other comprehensive income before income tax effect 1,786 1,206
Income tax effect (1,074) (383)
Other comprehensive income 712 823
Total comprehensive loss $ (14,427) $ (15,340)