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Computation of Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Net income (Loss) $ 54,926 $ (267) $ 56,044 $ 323
Weighted-average common shares outstanding (in shares) 21,757 20,700 21,241 20,461
Additional dilutive common stock equivalents 342   342 360
Diluted shares outstanding (in shares) 22,099 20,700 21,583 20,821
Net income (loss) per share - basic (in dollars per share) $ 2.52 $ (0.01) $ 2.64 $ 0.02
Net income (loss) per share - diluted (in dollars per share) $ 2.49 $ (0.01) $ 2.60 $ 0.02