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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Computation of basic and diluted net income per share [Abstract]    
Numerator- net income $ 34,701 $ 50,674
Denominator- weighted average shares    
Basic (in shares) 68,421,800 67,864,475
Dilutive effect of stock compensation awards (in shares) 1,586,690 [1] 1,690,466 [1]
Diluted (in shares) 70,008,490 69,554,941
Net income per share    
Basic (in dollars per share) $ 0.51 $ 0.75
Diluted (in dollars per share) $ 0.50 $ 0.73
Stock Options [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 22,000 25,000
Restricted Stock [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 400 60,000
[1] Excludes approximately 22,000 stock options and 400 shares of restricted stock for the three month period ended March 31, 2014 as the impact of such awards was anti-dilutive. Excludes approximately 250,000 stock options and 60,000 shares of restricted stock for the three month period ended March 31, 2013 as the impact of such awards was anti-dilutive.