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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Revenue	$ 1,034,560	$ 1,036,982	$ 998,383	$ 834,459	$ 997,507	$ 1,216,890	$ 1,197,783	$ 1,089,043	$ 3,904,384	$ 4,501,223	$ 4,108,269
Operating income (loss)	30,550	9,726	40,895	(46,604)	103,613	234,759	227,416	197,801	34,567	763,589	710,800
Net income (loss)	$ 15,975	$ 7,799	$ 25,596	$ (26,432)	$ 67,874	$ 144,883	$ 140,204	$ 122,641	$ 22,938	$ 475,602	$ 445,374
Basic earnings (loss) per share	$ 0.55	$ 0.27	$ 0.88	$ (0.88)	$ 2.19	$ 4.65	$ 4.51	$ 3.95	$ 0.78	$ 15.30	$ 14.35
Diluted earnings (loss) per share	$ 0.55	$ 0.27	$ 0.87	$ (0.88)	$ 2.17	$ 4.59	$ 4.45	$ 3.88	$ 0.77	$ 15.10	$ 14.13

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.