Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unaudited Condensed Consolidated Statement of Operations [Abstract]
Revenue	$ 751,710	$ 754,354	$ 1,500,981	$ 1,502,471
Costs and expenses	(590,339)	(588,097)	(1,178,114)	(1,158,770)
Gross profit	161,371	166,257	322,867	343,701
General and administrative expenses	(36,260)	(33,095)	(73,768)	(67,645)
Losses on divestitures and impairment charges, net	(30,641)	(5,582)	(30,988)	(7,361)
Operating income	94,470	127,580	218,111	268,695
Interest expense	(39,398)	(42,982)	(82,480)	(85,921)
Loss on early extinguishment of debt	(21,898)	0	(22,479)	0
Other expense, net	(535)	(109)	(746)	(167)
Income before income taxes	32,639	84,489	112,406	182,607
Provision for income taxes	(16,746)	(31,007)	(49,059)	(67,660)
Net income from continuing operations	15,893	53,482	63,347	114,947
Net loss from discontinued operations, net of tax	0	390	0	(390)
Net income	15,893	53,092	63,347	114,557
Net income attributable to noncontrolling interests	(273)	(497)	(282)	(587)
Net income attributable to common stockholders	$ 15,620	$ 52,595	$ 63,065	$ 113,970
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.08	$ 0.26	$ 0.32	$ 0.56
Basic weighted average number of shares	193,806	202,466	194,366	202,966
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.08	$ 0.25	$ 0.32	$ 0.55
Diluted weighted average number of shares	196,718	206,746	197,463	207,221
Dividends declared per share	$ 0.13	$ 0.10	$ 0.25	$ 0.20