REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Changes in Contract Assets and Liabilities (Details) $ in Thousands	12 Months Ended
Dec. 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	4,193
Contract asset, End of Period	4,193
Contract Liability
Contract liability, Beginning of Period	11,059
Recognition of revenue included in beginning of year contract liability	(3,081)
Contract liability, net of revenue recognized on contracts during the period	4,780
Foreign currency translation	(42)
Contract liability, End of Period	$ 12,716

Change In Contract With Customer, Asset [Roll Forward]

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Change In Contract With Customer, Liability [Roll Forward]

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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