Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 177,305	$ 234,934	$ 178,806
Foreign currency translation adjustments	10,331	(53,283)	(32,096)
Reclassification of foreign currency translation adjustments to discontinued operations	0	0	3,114
Total comprehensive income	187,636	181,651	149,824
Total comprehensive income attributable to noncontrolling interests	(270)	(1,129)	(6,382)
Total comprehensive income attributable to common stockholders	$ 187,366	$ 180,522	$ 143,442