Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance, shares at Dec. 31, 2013		91,254
Beginning Balance at Dec. 31, 2013	$ 1,044,373	$ 1	$ 672,165	$ 425,796	$ (53,589)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	74,467			73,200
Net Income Sse	73,200
Shares repurchased and retire, shares		(3,125)
Shares repurchased and retired	(91,475)		(91,475)
Shares issued in connection with share-based compensation (in shares)		1,214
Shares issued in connection with share-based compensation	15,213		15,213
Tax withholdings related to net share settlements	(15,980)		(15,980)
Share-based compensation	25,588		25,588
Adjust redeemable noncontrolling interests to redemption value	(6,555)			(6,555)
Other comprehensive income (loss)	(30,197)				(30,197)
Ending Balance, shares at Dec. 31, 2014		89,343
Ending Balance at Dec. 31, 2014	1,014,167	$ 1	605,511	492,441	(83,786)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	128,996			127,844
Net Income Sse	127,844
Shares repurchased and retire, shares		(2,528)
Shares repurchased and retired	(97,430)		(97,430)
Shares issued in connection with share-based compensation (in shares)		1,413
Shares issued in connection with share-based compensation	22,569		22,569
Tax withholdings related to net share settlements	(15,230)		(15,230)
Share-based compensation	35,786		35,786
Adjust redeemable noncontrolling interests to redemption value	(1,886)			(1,886)
Other comprehensive income (loss)	$ (36,330)				(36,330)
Ending Balance, shares at Dec. 31, 2015	88,228	88,228
Ending Balance at Dec. 31, 2015	$ 1,049,490	$ 1	551,206	618,399	(120,116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	106,550			106,550
Net Income Sse	106,550
Shares repurchased and retire, shares		(5,000)
Shares repurchased and retired	(195,003)		(195,003)
Shares issued in connection with share-based compensation (in shares)		1,140
Shares issued in connection with share-based compensation	14,907		14,907
Tax withholdings related to net share settlements	(10,507)		(10,507)
Share-based compensation	39,849		39,849
Other comprehensive income (loss)	$ (2,302)				(2,302)
Ending Balance, shares at Dec. 31, 2016	84,368	84,368
Ending Balance at Dec. 31, 2016	$ 1,002,984	$ 1	$ 400,452	$ 724,949	$ (122,418)