Unaudited Condensed Consolidated Statement of Operations Statement (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues	$ 602,506	$ 579,699
Costs and expenses	(474,939)	(453,253)
Gross profits	127,567	126,446
General and administrative expenses	(25,959)	(28,833)
(Losses) gains on divestitures and impairment charges, net	(490)	(420)
Operating income	101,118	97,193
Interest expense	(33,588)	(33,559)
Loss on early extinguishment of debt, net	0	(314)
Other income (expense), net	3,905	674
Income before income taxes	71,435	63,994
Provision for income taxes	(23,120)	24,065
Net income	48,315	39,929
Net income attributable to noncontrolling interests	290	1,165
Net income attributable to common stockholders	$ 48,025	$ 38,764
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.22	$ 0.16
Basic weighted average number of shares	220,132	239,772
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.22	$ 0.16
Diluted weighted average number of shares	223,212	242,052
Dividends declared per share	$ 0.05	$ 0.05