Condensed Consolidated Statement of Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2012	$ 1,170,946	$ 1	$ 866,720	$ 318,094	$ (15,514)	$ 1,645
Beginning Balance, Shares at Dec. 31, 2012	97,698,000	97,698,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	33,568			33,568		(26)
Net Income Sse	33,542
Shares issued in connection with share-based compensation (shares)		543,000
Shares issued in connection with share-based compensation (value)	4,621		4,621
Tax withholdings related to net share settlements of restricted stock units	(6,436)		(6,436)
Share-based compensation	8,142		8,142
Shares repurchased and retired (shares)		(2,881,000)
Shares repurchased and retired (value)	(75,676)		(75,676)
Sale Of Subsidiary Shares To Noncontrolling Interests	(1,619)					(1,619)
Other comprehensive income	(538)				(538)
Ending Balance at Mar. 31, 2013	$ 1,132,982	$ 1	$ 797,371	$ 351,662	$ (16,052)	$ 0
Ending Balance, Shares at Mar. 31, 2013	95,360,000	95,360,000