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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Comprehensive income (loss)    
Net income (loss) $ (4,401) $ 25,046
Other comprehensive income (loss) before income tax effect:    
Net unrealized loss on financial instruments (246) (11)
Net loss (gain) reclassified to income on financial instruments 272 (6)
Net gain on foreign currency cash flow hedges reclassified to income (47) (46)
Defined benefit plans and other postretirement benefits:    
Amortization of prior service benefit (1,025) (15,119)
Amortization of net loss 2,184 6,285
Other comprehensive income (loss) before income tax effect 1,138 (8,897)
Income tax effect (382) (2,460)
Other comprehensive income (loss) 756 (11,357)
Comprehensive income (loss) $ (3,645) $ 13,689