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Comprehensive Income (tables)
9 Months Ended
Sep. 30, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax Abstract 
Comprehensive Income Reconciliation [Text Block]
    Three Months Ended  Nine Months Ended
    September 30,  September 30,
Thousands  2011  2010  2011  2010
Net income (loss) $ (8,312) $ (7,420) $ 34,654 $ 43,076
 Amortization of employee benefit plan liability, net of tax   146   97   438   293
Total comprehensive income (loss) $ (8,166) $ (7,323) $ 35,092 $ 43,369