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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - Interest rate swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
DERIVATIVE FINANCIAL INSTRUMENTS
Gross gains	$ 13,537	$ 1,758	$ 1,468
Gross losses	(13,500)	$ (1,758)	$ (1,468)
Net gains (losses)	$ 37

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (b)(1)
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