Unaudited Condensed Consolidated Statement of Operations Statement (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues	$ 652,352	$ 602,506
Costs and expenses	(492,752)	(474,939)
Gross profits	159,600	127,567
General and administrative expenses	(30,866)	(25,959)
Losses (gains) on divestitures and impairment charges, net	(969)	(490)
Operating income	127,765	101,118
Interest expense	(32,769)	(33,588)
Other (expense) income, net	(984)	3,905
Income before income taxes	94,012	71,435
Provision for income taxes	(35,290)	(23,120)
Net income	58,722	48,315
Net income attributable to noncontrolling interests	(1,102)	(290)
Net income attributable to common stockholders	$ 57,620	$ 48,025
Basic earnings per share:
Net income attributable to common stockholders, basic	$ 0.27	$ 0.22
Basic weighted average number of shares	211,380	220,132
Diluted earnings per share:
Net income attributable to common stockholders, diluted	$ 0.27	$ 0.22
Diluted weighted average number of shares	215,208	223,212
Dividends declared per share	$ 0	$ 0