Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 234,934	$ 178,806	$ 152,588
Foreign currency translation adjustments	(53,283)	(32,096)	(23,292)
Reclassification of foreign currency translation adjustments to discontinued operations	0	3,114	0
Total comprehensive income	181,651	149,824	129,296
Total comprehensive income attributable to noncontrolling interests	(1,129)	(6,382)	(5,240)
Total comprehensive income attributable to common stockholders	$ 180,522	$ 143,442	$ 124,056