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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Computation of basic and diluted net income per share [Abstract]                      
Numerator- net income $ 48,518 $ 47,093 $ 28,254 $ 50,674 $ 28,287 $ 25,541 $ 9,335 $ 30,060 $ 174,539 $ 93,223 $ 324,643
Denominator- weighted average shares                      
Basic (in shares)                 68,081,632 67,360,632 67,130,356
Dilutive effect of stock compensation awards (in shares)                 1,585,897 [1] 1,832,506 [1] 667,015 [1]
Diluted (in shares)                 69,667,529 69,193,138 67,797,371
Net income per share                      
Basic (in dollars per share) $ 0.71 $ 0.69 $ 0.41 $ 0.75 $ 0.42 $ 0.38 $ 0.14 $ 0.45 $ 2.56 $ 1.38 $ 4.84
Diluted (in dollars per share) $ 0.69 $ 0.67 $ 0.40 $ 0.73 $ 0.41 $ 0.37 $ 0.14 $ 0.44 $ 2.51 $ 1.35 $ 4.79
Stock options and restricted stock awards [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 10,300 363,000 0
[1] Excludes approximately 10,300 and 363,000 stock options and restricted stock awards for the twelve month periods ended December 31, 2013 and December 31, 2012, respectively, as the impact of such awards was anti-dilutive. There were no anti-dilutive awards for the twelve month period ended December 31, 2011.