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Income (Loss) Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income (Loss) Per Common Share                      
Net income (loss) $ (22,085) $ (6,026) $ (4,081) $ (10,071) $ (9,055) $ 11,753 $ 11,818 $ 16,412 $ (42,263) $ 30,928 $ 127,987
Net income (loss) per common share:                      
Basic (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.23) $ 0.30 $ 0.31 $ 0.43 $ (1.09) $ 0.80 $ 3.23
Diluted (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.23) $ 0.30 $ 0.30 $ 0.42 $ (1.09) $ 0.79 $ 3.11
Basic weighted average shares outstanding 38,904,000 38,841,000 38,764,000 38,716,000 38,698,000 38,577,000 38,370,000 38,261,000 38,807,000 38,477,000 39,658,000
Dilutive effect of stock options, restricted stock awards and units and convertible debt (in shares)                   574,000 1,497,000
Diluted weighted average shares outstanding 38,904,000 38,841,000 38,764,000 38,716,000 38,698,000 39,169,000 38,988,000 38,863,000 38,807,000 39,051,000 41,155,000
Dilutive effect of assumed conversion of convertible debt (in shares)                     600,000