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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, 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
Quarterly Financial Data [Abstract]
Revenue	$ 1,440,224	$ 1,403,697	$ 1,434,231	$ 1,308,217	$ 1,225,061	$ 1,225,007	$ 1,266,520	$ 1,148,397	$ 5,586,369	$ 4,864,985	$ 4,476,412
Income from operations	98,156	115,621	120,020	110,161	39,612	57,991	67,957	92,808	443,958	258,368	270,794
Net income	$ 72,416	$ 98,582	$ 91,028	$ 88,132	$ 32,019	$ 38,204	$ 46,884	$ 59,446	$ 350,158	$ 176,553	$ 176,253
Basic earnings per share	$ 2.61	$ 3.55	$ 3.28	$ 3.18	$ 1.15	$ 1.37	$ 1.69	$ 2.13	$ 12.62	$ 6.35	$ 6.19
Diluted earnings per share	$ 2.55	$ 3.47	$ 3.22	$ 3.13	$ 1.15	$ 1.36	$ 1.68	$ 2.13	$ 12.38	$ 6.31	$ 6.17

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

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