Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 29,994	$ 24,110
Other comprehensive income (loss), net of income tax:
Foreign currency translation adjustment	12,195	(28,298)
Total comprehensive income (loss)	42,189	(4,188)
Total comprehensive income (loss) attributable to:
Stockholders	41,434	(4,335)
Non-controlling interests	$ 755	$ 147