Unaudited Condensed Consolidated Statement of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Unaudited Condensed Consolidated Statement of Operations [Abstract]
Revenue	$ 714,525	$ 718,314	$ 2,216,996	$ 2,210,569
Costs and expenses	(572,581)	(570,016)	(1,730,373)	(1,740,167)
Gross profit	141,944	148,298	486,623	470,402
General and administrative expenses	(28,158)	(39,748)	(96,781)	(141,885)
Gains on divestitures and impairment charges, net	10,764	26,570	3,403	58,752
Operating income	124,550	135,120	393,245	387,269
Interest expense	(43,921)	(43,376)	(129,842)	(134,679)
Loss on early extinguishment of debt	(6,918)	0	(6,918)	(29,158)
Other income (expense), net	334	(9)	167	1,577
Income before income taxes	74,045	91,735	256,652	225,009
Provision for income taxes	(26,118)	(74,934)	(93,778)	(134,998)
Net income from continuing operations	47,927	16,801	162,874	90,011
Net income (loss) from discontinued operations, net of tax	0	884	(390)	846
Net income	47,927	17,685	162,484	90,857
Net income attributable to noncontrolling interests	(479)	(34)	(1,066)	(6,182)
Net income attributable to common stockholders	$ 47,448	$ 17,651	$ 161,418	$ 84,675
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.24	$ 0.08	$ 0.80	$ 0.40
Basic weighted average number of shares	199,310	210,820	201,729	212,009
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.23	$ 0.08	$ 0.78	$ 0.39
Diluted weighted average number of shares	203,444	213,010	205,950	215,365
Dividends declared per share	$ 0.12	$ 0.09	$ 0.32	$ 0.25