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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Comprehensive income (loss):    
Net income (loss) $ (20,104) $ 8,253
Other comprehensive income before income tax effect:    
Net gain on foreign currency cash flow hedges reclassified as income (47) (47)
Amortization of prior service benefit during the period (952) (1,028)
Amortization of net loss during the period 1,811 2,352
Other comprehensive income before income tax effect 812 1,277
Income tax effect (713) (382)
Other comprehensive income 99 895
Total comprehensive income (loss) $ (20,005) $ 9,148