Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unaudited Condensed Consolidated Statement of Operations [Abstract]
Revenue	$ 731,346	$ 721,467	$ 2,282,298	$ 2,222,083
Costs and expenses	(581,644)	(580,722)	(1,771,986)	(1,756,425)
Operating profit	149,702	140,745	510,312	465,658
General and administrative expenses	(39,213)	(26,916)	(122,307)	(102,668)
(Losses) gains on divestitures and impairment charges, net	(143)	557	5,545	(30,432)
Hurricane Expenses, Net of Insurance Proceeds	(1,290)	0	(1,290)	0
Operating income	109,056	114,386	392,260	332,558
Interest expense	(42,754)	(39,508)	(125,473)	(121,988)
Loss on early extinguishment of debt	0	(25)	0	(22,503)
Other income (expense), net	276	110	(165)	(697)
Income before income taxes	66,578	74,963	266,622	187,370
(Provision for) benefit from income taxes	(10,437)	(27,422)	32,830	(76,482)
Net Income	56,141	47,541	299,452	110,888
Net income (loss) attributable to noncontrolling interests	23	186	(105)	(96)
Net income attributable to common stockholders	$ 56,164	$ 47,727	$ 299,347	$ 110,792
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.30	$ 0.25	$ 1.59	$ 0.57
Basic weighted average number of shares	187,435	193,274	187,761	193,999
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.29	$ 0.24	$ 1.56	$ 0.56
Diluted weighted average number of shares	192,243	196,567	192,417	197,175
Dividends declared per share	$ 0.15	$ 0.13	$ 0.43	$ 0.38