Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 4,318	$ 7,522
Foreign currency translation (loss) / gain	(2,448)	45
Other comprehensive (loss) / gain	(2,448)	45
Comprehensive income	$ 1,870	$ 7,567