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REVENUE RECOGNITION - Summary of Significant Changes in the Balances of Contract Liabilities and Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Contract Assets
Balance, beginning of period	$ 69,865
Amount recognized	(10,255)
Increase	25,277
Balance, end of period	84,887
Contract Liabilities
Balance, beginning of period	173,138
Revenue recognized	(33,544)
Increase due to billings	81,135
Balance, end of period	$ 220,729

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- Definition

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
-Paragraph 8
-Subparagraph (a)
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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