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Earnings Per Share (tables)
9 Months Ended
Sep. 30, 2011
Earnings per share of common stock [Abstract] 
EPS Calculation Table Text Block
   Three Months Ended Nine Months Ended
   September 30, September 30,
Thousands, except per share amounts  2011  2010  2011  2010
Net income (loss) $ (8,312) $ (7,420) $ 34,654 $ 43,076
Average common shares outstanding - basic   26,686   26,606   26,676   26,571
 Additional shares for stock-based compensation plans   -   -   54   70
Average common shares outstanding - diluted   26,686   26,606   26,730   26,641
Earnings (loss) per share of common stock - basic  $ (0.31) $ (0.28) $ 1.30 $ 1.62
Earnings (loss) per share of common stock - diluted $ (0.31) $ (0.28) $ 1.30 $ 1.62