Condensed, Consolidated Statements of Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	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
Net income	114,567			112,794		1,773
Other comprehensive loss	(3,708)				(3,708)
Formation of noncontrolling interests	1,806					1,806
Distribution to noncontrolling interests	(1,175)					(1,175)
Purchase of noncontrolling interests	(5,285)		(976)			(4,309)
Share-based compensation	10,340		10,340
Issuance of common stock under stock incentive plans, shares		1,313
Issuance of common stock under stock incentive plans	15,111	1	15,110
Stock repurchases, shares		(737)
Stock repurchases, value	(19,384)		(19,384)
Excess tax benefit from stock options	2,654		2,654
Tax benefit and other from stock options and awards	(4)		(4)
Other	163					163
Ending Balances at Sep. 30, 2013	1,309,478	89	398,099	904,003	(1,861)	9,148
Ending Balances, shares at Sep. 30, 2013		88,948
Beginning Balances at Dec. 31, 2013	1,317,540	89	384,721	928,720	(6,190)	10,200
Beginning Balances, shares at Dec. 31, 2013	88,508	88,508
Net income	108,879			107,079		1,800
Other comprehensive loss	(6,919)
Other comprehensive loss (excludes $358 related to mandatorily redeemable noncontrolling interests).	(6,561)				(6,391)	(170)
Formation of noncontrolling interests	933					933
Distribution to noncontrolling interests	(1,627)					(1,627)
Purchase of noncontrolling interests	29		29
Share-based compensation	12,234		12,234
Issuance of common stock under stock incentive plans, shares		614
Issuance of common stock under stock incentive plans	926		926
Stock repurchases, shares		(3,830)
Stock repurchases, value	(139,910)	(4)	(139,906)
Excess tax benefit from stock options	3,808		3,808
Ending Balances at Sep. 30, 2014	$ 1,296,251	$ 85	$ 261,812	$ 1,035,799	$ (12,581)	$ 11,136
Ending Balances, shares at Sep. 30, 2014	85,292	85,292