Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Unaudited Condensed Consolidated Statement of Operations [Abstract]
Document Period End Date			Jun. 30, 2018
Revenues	$ 796,092	$ 773,242	$ 1,590,574	$ 1,550,952
Costs and expenses	(607,965)	(589,724)	(1,206,685)	(1,190,195)
Operating profit	188,127	183,518	383,889	360,757
General and administrative expenses	(31,136)	(40,369)	(65,920)	(82,652)
Gains on divestitures and impairment charges, net	(6,865)	(753)	(7,347)	(5,688)
Hurricane Expenses, Net of Insurance Proceeds	(1,902)	0	330	0
Operating income	161,954	143,902	325,646	283,793
Interest expense	(44,519)	(42,083)	(88,095)	(82,719)
Loss on early extinguishment of debt, net	0	0	(10,131)	0
Other income (expense), net	1,880	(301)	2,264	(1,030)
Income before income taxes	119,315	101,518	229,684	200,044
(Provision for) benefit from income taxes	(16,034)	(32,956)	(44,355)	43,267
Net Income	103,281	68,562	185,329	243,311
Net income attributable to noncontrolling interests	(42)	(81)	(102)	(128)
Net income attributable to common stockholders	$ 103,239	$ 68,481	$ 185,227	$ 243,183
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.57	$ 0.37	$ 1.01	$ 1.29
Basic weighted average number of shares	182,637	187,597	183,877	187,927
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.55	$ 0.36	$ 0.98	$ 1.26
Diluted weighted average number of shares	187,188	192,138	188,547	192,511
Dividends declared per share	$ 0.170	$ 0.15	$ 0.34	$ 0.28