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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Other operating income, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue recognition:
Gain on disposal of solar power systems		$ (1,666)	$ (36,098)
Net (gain) loss on disposal of property, plant and equipment	$ (253)	1,227	2,565
Business interruption insurance compensation	(1,025)
Other operating income, net	(25,523)	(10,536)	(44,546)
Government grants
Revenue recognition:
Other operating income, net	$ (24,245)	$ (10,097)	$ (11,013)

X

- Definition

Amount of gain (loss) on sale or disposal of solar power systems and other investments.

+ References

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- Definition

The net loss on disposal of property, plant and equipment included in other operating expense.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114868897&loc=SL114872001-224240

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- Definition

The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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