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Income Taxes (Earnings Before Income Taxes) (Details) (USD $)
In Thousands, 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
Income Tax Disclosure [Abstract]                      
Domestic                 $ 697,062 $ 649,098 $ 545,527
Foreign                 16,406 25,057 29,554
Earnings before income taxes $ 157,274 $ 188,643 $ 192,379 $ 175,172 $ 158,151 $ 175,836 $ 179,039 $ 161,129 $ 713,468 $ 674,155 $ 575,081