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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings:        
Net income (numerator for basic and diluted calculations) $ 137,955 $ 144,475 $ 273,878 $ 408,904
Shares:        
Weighted average outstanding shares (denominator for basic calculation) 70,865 73,776 72,342 73,690
Equivalent shares from outstanding stock options 526 362 498 388
Denominator for diluted calculation 71,391 74,138 72,840 74,078
Earnings Per Share:        
Basic earnings per share $ 1.95 $ 1.96 $ 3.79 $ 5.55
Diluted earnings per share $ 1.93 $ 1.95 $ 3.76 $ 5.52