Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 3,095,031	$ 3,031,137	$ 2,986,041
Costs and expenses	(2,372,842)	(2,354,703)	(2,311,452)
Operating profit	722,189	676,434	674,589
General and administrative expenses	(154,423)	(137,730)	(130,813)
Gains (losses) on divestitures and impairment charges, net	7,015	(26,819)	6,522
Hurricane expense, net	(5,584)	0	0
Operating income	569,197	511,885	550,298
Interest expense	(169,125)	(162,093)	(172,897)
Losses on early extinguishment of debt, net	(274)	(22,503)	(6,918)
Other income (expense), net	460	(631)	(132)
Income from continuing operations before income taxes	400,258	326,658	370,351
Benefit from (provision for) income taxes	146,589	(149,353)	(135,027)
Income from continuing operations	546,847	177,305	235,324
Net (loss) income from discontinued operations, net of tax	0	0	(390)
Net income	546,847	177,305	234,934
Net income attributable to noncontrolling interests	(184)	(267)	(1,162)
Net income attributable to common stockholders	$ 546,663	$ 177,038	$ 233,772
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 2.91	$ 0.92	$ 1.17
Basic weighted average number of shares	187,630	193,086	200,356
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 2.84	$ 0.90	$ 1.14
Diluted weighted average number of shares	192,246	196,042	204,450
Dividends declared per share	$ 0.58	$ 0.51	$ 0.44