Condensed Consolidated Statement of Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Beginning Balance, Shares at Dec. 31, 2014	89,343	89,343
Beginning Balance at Dec. 31, 2014	$ 1,014,167	$ 1	$ 605,511	$ 492,441	$ (83,786)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Sse	90,138			90,138
Shares issued in connection with share-based compensation (shares)		1,317
Shares issued in connection with share-based compensation (value)	19,554		19,554
Tax withholdings related to net share settlements of restricted stock units	(14,425)		(14,425)
Share-based compensation	26,419		26,419
Stock Repurchased During Period, Shares		2,528
Stock Repurchased During Period, Value	(97,430)		(97,430)
Adjustment to redeemable noncontrolling interest to redemption value	(645)			(645)
Other comprehensive loss	$ (48,267)				(48,267)
Ending Balance, Shares at Sep. 30, 2015	88,132	88,132
Ending Balance at Sep. 30, 2015	$ 989,511	$ 1	$ 539,629	$ 581,934	$ (132,053)