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, 2013	$ 1,317,616	$ 89	$ 384,797	$ 928,720	$ (6,190)	$ 10,200
Beginning Balances (in shares) at Dec. 31, 2013		88,508
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,210 and $1,625 in 2014, $958 and $1,447 in 2015 and $2,415 and $1,613 in 2016 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	137,848			135,438		2,410
Other comprehensive income (excludes $469, $440 and $70 related to mandatorily redeemable noncontrolling interests in 2014, 2015, and 2016 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 (in shares)		881
Stock repurchases	(255,108)	$ (6)	(255,102)
Stock repurchases (in 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 (in shares) at Dec. 31, 2014		82,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,210 and $1,625 in 2014, $958 and $1,447 in 2015 and $2,415 and $1,613 in 2016 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	213,693			211,049		2,644
Other comprehensive income (excludes $469, $440 and $70 related to mandatorily redeemable noncontrolling interests in 2014, 2015, and 2016 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 (in shares)		911
Stock repurchases	(165,607)	$ (3)	(165,604)
Stock repurchases (in 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 (in shares) at Dec. 31, 2015		80,764
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $1,210 and $1,625 in 2014, $958 and $1,447 in 2015 and $2,415 and $1,613 in 2016 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	213,375			209,196		4,179
Other comprehensive income (excludes $469, $440 and $70 related to mandatorily redeemable noncontrolling interests in 2014, 2015, and 2016 respectively)	4,673				4,628	45
Formation of noncontrolling interests	86,640					86,640
Distribution to noncontrolling interests	(3,309)					(3,309)
Purchase of noncontrolling interests	(4,173)		(2,107)			(2,066)
Share-based compensation	18,762		18,762
Issuance of common stock under stock incentive plans	3,965	$ 0	3,965
Issuance of common stock under stock incentive plans (in shares)		724
Stock repurchases	(17,219)	$ 0	(17,219)
Stock repurchases (in shares)		(257)
Excess tax benefit from stock based compensation	10,711		10,711
Other	(1,734)		(1,663)	(12)		(59)
Ending Balances at Dec. 31, 2016	$ 1,568,725	$ 81	$ 32,157	$ 1,484,391	$ (45,406)	$ 97,502
Ending Balances (in shares) at Dec. 31, 2016		81,231