Condensed, Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Noncontrolling Interests
Beginning Balances (in shares) at Dec. 31, 2015		80,764
Beginning Balances at Dec. 31, 2015	$ 1,257,034	$ 81	$ 19,708	$ 1,275,207	$ (50,034)	$ 12,072
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $641 and $365 during the three months ended March 31, 2016 and $384 and $406 during the three months ended March 31, 2017 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	46,716			46,227		489
Other comprehensive income (excludes $167 for the three months ended March 31, 2016 and $21 for the three months ended March 31, 2017 related to mandatorily redeemable noncontrolling interests)	12,431				12,245	186
Distributions to noncontrolling interests	(637)					(637)
Purchase of noncontrolling interests (excludes ($1,210) related to redeemable noncontrolling interests) in 2017	(3,730)		(1,821)			(1,909)
Share-based compensation	4,906		4,906
Issuance of common stock under stock incentive plans (in shares)		55
Issuance of common stock under stock incentive plans	286		286
Stock repurchases (in shares)		(18)
Stock repurchases	(843)		(843)
Excess tax benefit from share-based compensation	445		445
Other	(107)					(107)
Ending Balances (in shares) at Mar. 31, 2016		80,801
Ending Balances at Mar. 31, 2016	$ 1,316,501	$ 81	22,681	1,321,434	(37,789)	10,094
Beginning Balances (in shares) at Dec. 31, 2016	81,231	81,231
Beginning Balances at Dec. 31, 2016	$ 1,568,725	$ 81	32,157	1,484,391	(45,406)	97,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (excludes $641 and $365 during the three months ended March 31, 2016 and $384 and $406 during the three months ended March 31, 2017 related to redeemable and mandatorily redeemable noncontrolling interests, respectively)	51,663			51,093		570
Other comprehensive income (excludes $167 for the three months ended March 31, 2016 and $21 for the three months ended March 31, 2017 related to mandatorily redeemable noncontrolling interests)	2,360				2,322	38
Formation of noncontrolling interests	335					335
Distributions to noncontrolling interests	(534)					(534)
Purchase of noncontrolling interests (excludes ($1,210) related to redeemable noncontrolling interests) in 2017	(190)		(190)
Share-based compensation	3,962		3,962
Issuance of common stock under stock incentive plans (in shares)		32
Issuance of common stock under stock incentive plans	90		90
Stock repurchases (in shares)		(1)
Stock repurchases	(95)		(95)
Other	$ 18		1,088			(1,070)
Ending Balances (in shares) at Mar. 31, 2017	81,262	81,262
Ending Balances at Mar. 31, 2017	$ 1,626,334	$ 81	$ 37,012	$ 1,535,484	$ (43,084)	$ 96,841