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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Comprehensive income (loss)    
Net income (loss) $ 8,253 $ (4,401)
Other comprehensive income before income tax effect:    
Net unrealized loss on financial instruments 0 (246)
Net loss reclassified to income on financial instruments 0 272
Net amount of foreign currency cash flow hedges reclassified as income (47) (47)
Amortization of prior service benefit during the period (1,028) (1,025)
Amortization of net loss during the period 2,352 2,184
Other comprehensive income before income tax effect 1,277 1,138
Income tax effect (382) (382)
Other comprehensive income 895 756
Total comprehensive income (loss) $ 9,148 $ (3,645)