Unaudited Condensed Consolidated Statement of Operations Statement (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 581,182	$ 572,999	$ 1,781,060	$ 1,729,472
Costs and expenses	(459,911)	(465,949)	(1,404,033)	(1,380,953)
Gross profits	121,271	107,050	377,027	348,519
General and administrative expenses	(26,410)	(23,863)	(81,927)	(77,381)
Losses (gains) on divestitures and impairment charges, net	315	(5,001)	883	(15,264)
Operating income	95,176	78,186	295,983	255,874
Interest expense	(33,568)	(33,038)	(101,050)	(100,476)
Loss on early extinguishment of debt, net	0	(1,355)	0	(3,504)
Other (expense) income, net	2,317	249	4,001	969
Income before income taxes	63,925	44,042	198,934	152,863
Provision for income taxes	(22,128)	(9,027)	(71,183)	(51,181)
Net income	41,797	35,015	127,751	101,682
Net income attributable to noncontrolling interests	(735)	481	(1,588)	(1,329)
Net income attributable to common stockholders	$ 41,062	$ 35,496	$ 126,163	$ 100,353
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.19	$ 0.15	$ 0.58	$ 0.42
Basic weighted average number of shares	214,914	232,917	216,974	237,037
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.19	$ 0.15	$ 0.57	$ 0.42
Diluted weighted average number of shares	218,460	235,513	220,306	239,528
Dividends declared per share	$ 0	$ 0.05	$ 0	$ 0