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INVESTMENTS IN AFFILIATES - Tax equity transactions (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jul. 31, 2020	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax equity transactions
Gain on disposal of investment in affiliates			$ 13,936	$ 1,928	$ 47,102
Class B membership interests
Tax equity transactions
Net assets derecognized	$ 18,486
Value wrote down		$ 4,995
RE Roserock Holdings LLC ("Roserock")
Tax equity transactions
Ownership percentage				49.00%

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The decrease of net assets after tax equity transactions.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Paragraph 3
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Amount of gain (loss) on sale or disposal of an equity method investment.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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