Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning Balances at Dec. 31, 2012	$ 1,194,393	$ 88	$ 390,359	$ 791,209	$ 1,847	$ 10,890
Beginning Balances, shares at Dec. 31, 2012		88,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,233 and $2,003 in 2013, $1,210 and $1,625 in 2014 and $958 and $1,447 in 2015 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	139,686			137,511		2,175
Other comprehensive income (excludes $44, $469, and $440 related to mandatorily redeemable noncontrolling interests in 2013, 2014, and 2015 respectively)	(8,043)				(8,037)	(6)
Formation of noncontrolling interests	3,336					3,336
Distribution to noncontrolling interests	(1,886)					(1,886)
Purchase of noncontrolling interests	(5,094)		(785)			(4,309)
Share-based compensation	14,104		14,104
Issuance of common stock under stock incentive plans	17,233	$ 2	17,231
Issuance of common stock under stock incentive plans, shares		1,559
Stock repurchases	(39,367)	$ (1)	(39,366)
Stock repurchases, shares		(1,423)
Excess tax benefit from stock based compensation	3,446		3,446
Tax shortfall and other from stock options and awards	(268)		(268)
Other	76		76
Ending Balances at Dec. 31, 2013	1,317,616	$ 89	384,797	928,720	(6,190)	10,200
Ending Balances, shares at Dec. 31, 2013		88,508
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,233 and $2,003 in 2013, $1,210 and $1,625 in 2014 and $958 and $1,447 in 2015 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	137,848			135,438		2,410
Other comprehensive income (excludes $44, $469, and $440 related to mandatorily redeemable noncontrolling interests in 2013, 2014, and 2015 respectively)	(13,494)				(13,207)	(287)
Formation of noncontrolling interests	933					933
Distribution to noncontrolling interests	(2,281)					(2,281)
Purchase of noncontrolling interests	30		30
Share-based compensation	17,200		17,200
Issuance of common stock under stock incentive plans	2,859	$ 0	2,859
Issuance of common stock under stock incentive plans, shares		881
Stock repurchases	(255,108)	$ (6)	(255,102)
Stock repurchases, shares		(6,452)
Excess tax benefit from stock based compensation	6,241		6,241
Tax shortfall and other from stock options and awards	(223)		(223)
Ending Balances at Dec. 31, 2014	1,211,621	$ 83	155,802	1,064,158	(19,397)	10,975
Ending Balances, shares at Dec. 31, 2014		82,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,233 and $2,003 in 2013, $1,210 and $1,625 in 2014 and $958 and $1,447 in 2015 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	213,693			211,049		2,644
Other comprehensive income (excludes $44, $469, and $440 related to mandatorily redeemable noncontrolling interests in 2013, 2014, and 2015 respectively)	(31,159)				(30,637)	(522)
Formation of noncontrolling interests	1,916					1,916
Distribution to noncontrolling interests	(2,468)					(2,468)
Purchase of noncontrolling interests	(690)		(217)			(473)
Share-based compensation	16,264		16,264
Issuance of common stock under stock incentive plans	2,683	$ 1	2,682
Issuance of common stock under stock incentive plans, shares		911
Stock repurchases	(165,607)	$ (3)	(165,604)
Stock repurchases, shares		(3,084)
Excess tax benefit from stock based compensation	11,089		11,089
Tax shortfall and other from stock options and awards	(308)		(308)
Ending Balances at Dec. 31, 2015	$ 1,257,034	$ 81	$ 19,708	$ 1,275,207	$ (50,034)	$ 12,072
Ending Balances, shares at Dec. 31, 2015		80,764