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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Computation of basic and diluted net income per share [Abstract]        
Numerator- net income $ 47,093 $ 25,541 $ 126,021 $ 64,936
Denominator- weighted average shares        
Basic (in shares) 68,198,006 67,415,363 68,026,705 67,308,758
Dilutive effect of stock compensation awards (in shares) 1,689,019 [1] 1,751,138 [1] 1,600,510 [1] 1,672,212 [1]
Diluted (in shares) 69,887,025 69,166,501 69,627,215 68,980,970
Net income per share        
Basic (in dollars per share) $ 0.69 $ 0.38 $ 1.85 $ 0.96
Diluted (in dollars per share) $ 0.67 $ 0.37 $ 1.81 $ 0.94
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) 8,000 2,000 18,000 259,000
[1] Excludes approximately 8,000 and 18,000 stock options for the three and nine month periods ended September 30, 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 2,000 and 259,000 stock options for the three and nine month periods ended September 30, 2012, respectively, as the impact of such awards was anti-dilutive.