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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Comprehensive income (loss):        
Net income (loss) $ 50,405 $ (9,507) $ 50,645 $ (30,638)
Other comprehensive income (loss) before income tax effect:        
Net gain on foreign currency cash flow hedges reclassified as income (46) (46) (139) (139)
Net gain arising during the period    0 440 10,349
Amortization of prior service benefit during the period (952) (968) (2,856) (2,912)
Amortization of net loss during the period 1,402 1,880 4,207 6,362
Other comprehensive income before income tax effect 404 866 1,652 13,660
Income tax effect (557) (383) (1,837) (1,148)
Other comprehensive income (loss) (153) 483 (185) 12,512
Total comprehensive income (loss) $ 50,252 $ (9,024) $ 50,460 $ (18,126)