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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Revenue	$ 1,225,061	$ 1,225,007	$ 1,266,520	$ 1,148,397	$ 1,110,100	$ 1,128,074	$ 1,169,409	$ 1,068,829	$ 4,864,985	$ 4,476,412	$ 3,904,384
Operating income (loss)	39,612	57,991	67,957	92,808	60,029	30,867	106,725	73,173	258,368	270,794	34,567
Net income (loss)	$ 32,019	$ 38,204	$ 46,884	$ 59,446	$ 43,793	$ 19,610	$ 66,730	$ 46,120	$ 176,553	$ 176,253	$ 22,938
Basic earnings per share	$ 1.15	$ 1.37	$ 1.69	$ 2.13	$ 1.56	$ 0.69	$ 2.33	$ 1.60	$ 6.35	$ 6.19	$ 0.78
Diluted earnings per share	$ 1.15	$ 1.36	$ 1.68	$ 2.13	$ 1.55	$ 0.69	$ 2.32	$ 1.60	$ 6.31	$ 6.17	$ 0.77

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