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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenue recognition - Contract assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract Assets
Accounts receivables, unbilled	$ 28,461	$ 15,256
Contract Liabilities
Advances from customers	189,470	134,806
Other current liabilities	35,012	20,917
Contract liability	224,482	$ 155,723
Revenue recognized from beginning balance of contract liabilities	139,387
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Contract Liabilities
Contract liabilities expected to be recognized	$ 224,482
Period for contract liabilities expected to be realized	1 year

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Amount of other current liabilities relating to contract liabilities.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

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-Publisher FASB
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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-Name Accounting Standards Codification
-Topic 606
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
-Paragraph 8
-Subparagraph (b)
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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