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Quarterly Financial Information (Summary of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Revenue	$ 1,009,206	$ 1,048,457	$ 1,060,666	$ 990,782	$ 1,026,944	$ 1,058,233	$ 1,033,498	$ 925,020	$ 4,109,111	$ 4,043,695	$ 3,358,112
Operating income	188,264	217,527	234,489	178,426	218,845	228,385	220,481	149,340	818,706	817,051	575,886
Net income	$ 144,024	$ 164,099	$ 174,072	$ 133,323	$ 159,459	$ 173,442	$ 163,434	$ 109,333	$ 615,518	$ 605,668	$ 463,774
Earnings per share:
Earnings Per Share, Basic	$ 1.81	$ 2.05	$ 2.16	$ 1.65	$ 1.96	$ 2.12	$ 1.99	$ 1.33	$ 7.67	$ 7.39	$ 5.63
Earnings Per Share, Diluted	1.80	2.05	2.16	1.64	1.95	2.12	1.99	1.33	7.66	7.38	5.63
Dividends declared per share	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.13	$ 0.13	$ 0.13	$ 0.13	$ 0.68	$ 0.52	$ 0.40

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