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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Computation of basic and diluted net income per share [Abstract]        
Numerator- net income $ 28,254 $ 9,335 $ 78,928 $ 39,395
Denominator- weighted average shares        
Basic (in shares) 68,140,330 67,309,260 68,003,164 67,254,870
Dilutive effect of stock compensation awards (in shares) 1,669,269 [1] 1,336,273 [1] 1,798,333 [1] 1,344,997 [1]
Diluted (in shares) 69,809,599 68,645,533 69,801,498 68,599,867
Net income per share        
Net income per share, Basic (in dollars per share) $ 0.41 $ 0.14 $ 1.16 $ 0.59
Net income per share, Diluted (in dollars per share) $ 0.40 $ 0.14 $ 1.13 $ 0.57
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) 300,000 360,000 250,000 360,000
[1] Excludes approximately 300,000 and 250,000 stock options for the three and six month periods ended June 30, 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 360,000 stock options for the three and six month periods ended June 30, 2012 as the impact of such awards was anti-dilutive.