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Commitments And Contingencies (Changes in Self-insurance Liability) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Adjustment to self insurance reserves	$ (29,600)	$ (15,200)	$ 84,500	$ (62,200)	$ 69,300
Insurance Related Expenses [Roll Forward]
Balance, beginning of period				710,245	668,100	$ 721,284
Reserves provided				16,085	141,790	64,737
Payments				(34,277)	(99,645)	(117,921)
Balance, end of period	$ 692,053	$ 710,245		$ 692,053	$ 710,245	$ 668,100