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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 609,951	$ 581,182	$ 1,887,808	$ 1,781,060
Costs and expenses	(493,872)	(459,911)	(1,486,308)	(1,404,033)
Gross profits	116,079	121,271	401,500	377,027
General and administrative expenses	(33,764)	(26,410)	(95,792)	(81,927)
Losses (gains) on divestitures and impairment charges, net	981	315	(5,533)	883
Operating income	83,296	95,176	300,175	295,983
Interest expense	(38,080)	(33,568)	(103,589)	(101,050)
Gains on early extinguishment of debt, net	0	0	468	0
Other (expense) income, net	666	2,317	(1,017)	4,001
Income before income taxes	45,882	63,925	196,037	198,934
Provision for income taxes	(18,488)	(22,128)	(75,485)	(71,183)
Net income	27,394	41,797	120,552	127,751
Net income attributable to noncontrolling interests	(615)	(735)	(2,537)	(1,588)
Net income attributable to common stockholders	$ 26,779	$ 41,062	$ 118,015	$ 126,163
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.13	$ 0.19	$ 0.56	$ 0.58
Basic weighted average number of shares	211,954	214,914	211,721	216,974
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.12	$ 0.19	$ 0.55	$ 0.57
Diluted weighted average number of shares	216,370	218,460	215,877	220,306
Dividends declared per share	$ 0.07	$ 0.06	$ 0.20	$ 0.17