Unaudited Condensed Consolidated Statement of Operations Statement (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 576,774	$ 555,273	$ 1,156,473	$ 1,086,136
Costs and expenses	(461,751)	(445,975)	(915,004)	(864,480)
Gross profits	115,023	109,298	241,469	221,656
General and administrative expenses	(24,685)	(26,974)	(53,518)	(53,226)
Losses on divestitures and impairment charges, net	(9,843)	13,602	(10,263)	13,122
Operating income	80,495	95,926	177,688	181,552
Interest expense	(33,879)	(32,483)	(67,438)	(64,784)
Loss on early extinguishment of debt, net	(1,835)	(291)	(2,149)	(291)
Other income (expense), net	46	4,273	720	2,389
Income before income taxes	44,827	67,425	108,821	118,866
Provision for income taxes	(18,089)	(27,198)	(42,154)	(47,314)
Net income	26,738	40,227	66,667	71,552
Net income attributable to noncontrolling interests	(645)	58	(1,810)	(355)
Net income attributable to common stockholders	$ 26,093	$ 40,285	$ 64,857	$ 71,197
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.11	$ 0.16	$ 0.27	$ 0.28
Basic weighted average number of shares	238,498	251,763	239,131	253,074
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.11	$ 0.16	$ 0.27	$ 0.28
Diluted weighted average number of shares	241,435	253,583	241,589	254,862
Dividends declared per share	$ 0.05	$ 0.04	$ 0.10	$ 0.08