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REVENUE RECOGNITION - Summary of Significant Changes in the Balances of Contract Liabilities and Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Contract Assets
Balance, beginning of period	$ 69,865
Amount recognized	(4,955)
Increase	11,828
Balance, end of period	76,738
Contract Liabilities
Balance, beginning of period	173,138
Revenue recognized	(16,235)
Increase due to billings	35,200
Balance, end of period	$ 192,103

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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