Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 9,305	$ 23,361	$ 29,788	$ 37,579
Other comprehensive income (loss):
Foreign currency translation adjustments	513	(110)	(8,799)	853
Other comprehensive income (loss)	513	(110)	(8,799)	853
Comprehensive income	9,818	23,251	20,989	38,432
Comprehensive (income) loss attributable to non-controlling interest	(12)	3	251	62
Comprehensive income attributable to controlling interest	$ 9,806	$ 23,254	$ 21,240	$ 38,494