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Net Income (Loss) Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Income (Loss) Per Common Share        
Number of outstanding options not included in computation of Diluted EPS (in shares) 3,945,000 4,153,000 3,963,000 4,391,000
Numerator        
Net Income (Loss) $ 20,933 $ 116 $ 37,211 $ (9,369)
Denominator        
Weighted average number of common shares outstanding 51,241,000 51,570,000 51,022,000 52,704,000
Effect of outstanding share-based awards 912,000 745,000 586,000  
Weighted average number of shares for diluted net income (loss) per common share 52,153,000 52,315,000 51,608,000 52,704,000
Basic earnings (loss) per share (in dollars per share) $ 0.41 $ 0.00 $ 0.73 $ (0.18)
Diluted earnings (loss) per share (in dollars per share) $ 0.40 $ 0.00 $ 0.72 $ (0.18)