REVENUES FROM CONTRACT WITH CUSTOMERS - Schedule of Changes in Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Contract Asset
Contract asset, beginning of period	$ 3,552
Transferred to trade receivable of contract asset included in beginning of the year contract asset	(3,552)
Contract asset, net of transferred to trade receivables on contracts during the period	4,856
Contract asset, End of Period	4,856
Contract Liability
Contract liability, Beginning of Period	11,059
Recognition of revenue included in beginning of year contract liability	(1,750)
Contract liability, net of revenue recognized on contracts during the period	931
Foreign currency translation	28
Contract liability, End of Period	$ 10,268