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Earnings Per Share (Basic and Diluted Earnings) (Details) (USD $)
In Thousands, except Per 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
Earnings Per Share [Abstract]                      
Net income $ 79,622 $ 83,379 $ 87,853 $ 76,584 $ 61,353 $ 72,300 $ 81,683 $ 62,664 $ 327,438 $ 278,000 $ 214,945
Weighted average number of common shares outstanding                 30,957 31,513 31,217
Dilutive stock awards                 324 270 558
Diluted weighted average number of common shares outstanding                 31,281 31,783 31,775
Basic earnings per share $ 2.57 $ 2.70 $ 2.84 $ 2.47 $ 1.96 $ 2.28 $ 2.58 $ 2.00 $ 10.58 $ 8.82 $ 6.89
Diluted earnings per share $ 2.53 $ 2.66 $ 2.82 $ 2.45 $ 1.95 $ 2.27 $ 2.56 $ 1.97 $ 10.47 $ 8.75 $ 6.76