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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	120,781			120,781		(26)
Net Income Sse	120,755
Shares issued in connection with share-based compensation (shares)		1,019,000
Shares issued in connection with share-based compensation (value)	11,662		11,662
Tax withholdings related to net share settlements of restricted stock units	(6,893)		(6,893)
Share-based compensation	20,810		20,810
Shares repurchased and retired (shares)		(5,000,000)
Shares repurchased and retired (value)	(133,565)		(133,565)
Sale Of Subsidiary Shares To Noncontrolling Interests	(1,619)					(1,619)
Other comprehensive income	(31,127)				(31,127)
Ending Balance at Sep. 30, 2013	$ 1,150,969	$ 1	$ 758,734	$ 438,875	$ (46,641)	$ 0
Ending Balance, Shares at Sep. 30, 2013	93,717,000	93,717,000