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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Summary of comprehensive income          
Net income (loss) $ (109,705) $ 9,425 $ (102,912) $ 17,342 $ 44,198
Other comprehensive income:          
Adjustment to pension liability 1,501 1,142 3,002 2,283  
Tax expense (600) (457) (1,200) (913)  
Adjustment to pension liability, net of tax 901 685 1,802 1,370  
Foreign currency translation adjustments (915) 240 (29) 1,024  
Total other comprehensive income (14) 925 1,773 2,394 (11,641)
Total comprehensive income (loss) $ (109,691) $ 10,350 $ (101,139) $ 19,736