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Computation of Earnings per Share - Summary of net income per share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net income (loss):        
Income (loss) from continuing operations $ (1,153) $ 10,080 $ 1,011 $ 65,981
Income from discontinued operations    217    360
Net income (loss) $ (1,153) $ 10,297 $ 1,011 $ 66,341
Shares outstanding:        
Weighted-average common shares outstanding (in shares) 22,571 22,339 22,533 21,609
Additional dilutive common stock equivalents (in shares)    162 90 279
Diluted shares outstanding (in shares) 22,571 22,501 22,623 21,888
Basic net income (loss) per share:        
Basic net income (loss) per share from continuing operations (in dollars per share) $ (0.05) $ 0.45 $ 0.04 $ 3.05
Basic net income per share from discontinued operations (in dollars per share) $ 0.00 $ 0.01 $ 0.00 $ 0.02
Basic net income (loss) per share (in dollars per share) $ (0.05) $ 0.46 $ 0.04 $ 3.07
Diluted net income (loss) per share:        
Diluted net income (loss) per share from continuing operations (in dollars per share) $ (0.05) $ 0.45 $ 0.04 $ 3.01
Diluted net income per share from discontinued operations (in dollars per share) $ 0.00 $ 0.01 $ 0.00 $ 0.02
Diluted net income (loss) per share (in dollars per share) $ (0.05) $ 0.46 $ 0.04 $ 3.03