Condensed Consolidated Statement of Equity (Unaudited) - 6 months ended Jun. 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	61,968			61,968
Shares issued in connection with share-based compensation (shares)		1,226
Shares issued in connection with share-based compensation (value)	18,109		18,109
Tax withholdings related to net share settlements of restricted stock units	(12,742)		(12,742)
Share-based compensation	18,539		18,539
Stock Repurchased During Period, Shares		1,500
Stock Repurchased During Period, Value	(58,720)		(58,720)
Adjustment to redeemable noncontrolling interest to redemption value	494			494
Other comprehensive loss	$ (21,460)				(21,460)
Ending Balance, Shares at Jun. 30, 2015	89,069	89,069
Ending Balance at Jun. 30, 2015	$ 1,020,355	$ 1	$ 570,697	$ 554,903	$ (105,246)