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, 2013	$ 1,044,373	$ 1	$ 672,165	$ 425,796	$ (53,589)
Beginning Balance, Shares at Dec. 31, 2013	91,254	91,254
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Sse	13,198
Shares issued in connection with share-based compensation (shares)		944
Shares issued in connection with share-based compensation (value)	4,440		4,440
Tax withholdings related to net share settlements of restricted stock units	(15,034)		(15,034)
Share-based compensation	15,808		15,808
Shares repurchased and retired (shares)		(1,065)
Shares repurchased and retired (value)	(32,041)		(32,041)
Adjust redeemable noncontrolling interest to redemption value	26
Other comprehensive income	19,332				19,332
Ending Balance at Jun. 30, 2014	1,050,102	1	645,338	439,020	(34,257)
Ending Balance, Shares at Jun. 30, 2014	91,814	91,133
Beginning Balance at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	6,342				6,342
Ending Balance at Jun. 30, 2014	$ 1,050,102			$ 439,020	$ (34,257)
Ending Balance, Shares at Jun. 30, 2014	91,814