OTHER NONOPERATING EXPENSE, NET (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income and Expenses [Abstract]
Interest income	$ 151	$ 115	$ 293	$ 267
Foreign currency exchange gain / (loss), net	7	2,155	(6,335)	(922)
Change in fair value of derivatives	0	0	0	(36)
Loss on extinguishment of debt	0	(84)	0	(235)
Other income, net	170	51	234	66
Total other non-operating income / (expense), net	$ 328	$ 2,237	$ (5,808)	$ (860)