Condensed Consolidated Statement of Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Beginning Balance at Dec. 31, 2014	$ 1,014,167	$ 1	$ 605,511	$ 492,441	$ (83,786)
Beginning Balance, Shares at Dec. 31, 2014	89,343	89,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Sse	29,179
Shares issued in connection with share-based compensation (shares)		851
Shares issued in connection with share-based compensation (value)	10,701		10,701
Tax withholdings related to net share settlements of restricted stock units	(11,792)		(11,792)
Share-based compensation	8,732		8,732
Adjustment to redeemable noncontrolling interest to redemption value	1,448
Other comprehensive income	(24,248)
Ending Balance at Mar. 31, 2015	$ 1,028,187	$ 1	$ 613,152	$ 523,068	$ (108,034)
Ending Balance, Shares at Mar. 31, 2015	90,914	90,194