REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Changes in Contract Assets and Liabilities (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($)
Contract Asset
Contract asset, Beginning of period	$ 7,430
Transferred to trade receivable of contract asset included in beginning of the year contract asset	(7,430)
Contract asset, net of transferred to trade receivables on contracts during the period	8,378
Contract asset, End of Period	8,378
Contract Liability
Contract liability, Beginning of Period	11,961
Contract liability, net of revenue recognized on contracts during the period	(4,291)
Recognition of revenue included in beginning of year contract liability	3,694
Foreign currency translation	(26)
Contract liability, End of Period	$ 11,338

Change In Contract With Customer, Asset [Roll Forward]

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Change In Contract With Customer, Liability [Roll Forward]

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Contract With Customer, Asset, Net Of Reclassified To Receivable

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Contract With Customer, Liability, Increase (Decrease) From Foreign Currency Translation

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Contract with Customer, Liability, Net Of Revenue Recognized

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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