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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Revenue	$ 997,507	$ 1,216,890	$ 1,197,783	$ 1,089,043	$ 1,069,811	$ 1,084,222	$ 1,050,073	$ 904,163	$ 4,501,223	$ 4,108,269	$ 3,214,591
Operating income	103,613	234,759	227,416	197,801	187,872	207,436	179,842	135,650	763,589	710,800	532,720
Net income	$ 67,874	$ 144,883	$ 140,204	$ 122,641	$ 121,234	$ 130,801	$ 110,270	$ 83,069	$ 475,602	$ 445,374	$ 327,438
Basic earnings per share	$ 2.19	$ 4.65	$ 4.51	$ 3.95	$ 3.91	$ 4.22	$ 3.55	$ 2.67	$ 15.30	$ 14.35	$ 10.58
Diluted earnings per share	$ 2.17	$ 4.59	$ 4.45	$ 3.88	$ 3.84	$ 4.15	$ 3.50	$ 2.64	$ 15.10	$ 14.13	$ 10.47

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.