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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income (numerator for basic and diluted calculations) $ 236,103 $ 130,391 $ 312,575 $ 255,505
Shares:        
Weighted average outstanding shares (denominator for basic calculation) 64,126 66,351 64,348 67,246
Equivalent shares from outstanding stock options 670 769 660 785
Denominator for diluted calculation 64,796 67,120 65,008 68,031
Earnings Per Share:        
Basic earnings per share $ 3.68 $ 1.97 $ 4.86 $ 3.80
Diluted earnings per share $ 3.64 $ 1.94 $ 4.81 $ 3.76