Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income (loss)	$ 5,655	$ (4,719)
Other comprehensive loss:
Foreign currency translation adjustment	(1,513)	(2,345)
Reclassifications of foreign currency translation adjustment to Other operating expense on the consolidated statements of operations
Income tax expense related to other comprehensive loss
Comprehensive income (loss) attributable to noncontrolling interests	4,142	(7,064)
Comprehensive loss attributable to noncontrolling interests	58	49
Comprehensive income (loss) attributable to controlling interests	$ 4,200	$ (7,015)