Unaudited Condensed Consolidated Statement of Operations Statement - Segment [Domain] - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues	$ 754,354	$ 746,760	$ 1,502,471	$ 1,492,255
Costs and expenses	(587,624)	(590,716)	(1,157,792)	(1,170,151)
Gross profits	166,730	156,044	344,679	322,104
General and administrative expenses	(33,568)	(46,307)	(68,623)	(102,137)
Losses (gains) on divestitures and impairment charges, net	(5,582)	34,994	(7,361)	32,182
Operating income	127,580	144,731	268,695	252,149
Interest expense	(42,982)	(46,307)	(85,921)	(91,303)
Gains on early extinguishment of debt, net	0	(29,158)	0	(29,158)
Other (expense) income, net	(109)	50	(167)	1,586
Income before income taxes	84,489	69,316	182,607	133,274
Provision for income taxes	(31,007)	(37,357)	(67,660)	(60,064)
Net income	53,092	31,781	114,557	73,172
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(390)	(178)	(390)	(38)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	53,482	31,959	114,947	73,210
Net income attributable to noncontrolling interests	(497)	(5,859)	(587)	(6,148)
Net income attributable to common stockholders	$ 52,595	$ 25,922	$ 113,970	$ 67,024
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.26	$ 0.12	$ 0.56	$ 0.32
Basic weighted average number of shares	202,466	212,390	202,966	212,613
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.25	$ 0.12	$ 0.55	$ 0.31
Diluted weighted average number of shares	206,746	215,989	207,221	216,593
Dividends declared per share	$ 0.10	$ 0.08	$ 0.20	$ 0.16