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FINANCIAL INSTRUMENTS - Summary of interest rate swaps (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Feb. 29, 2016
Debt Instrument [Line Items]
Derivative, notional amount	$ 561,318
Interest rate swap 1
Debt Instrument [Line Items]
Derivative, notional amount	$ 11,318
Derivative, fixed interest rate (as a percent)	1.907%
Interest rate swap 2
Debt Instrument [Line Items]
Derivative, notional amount	$ 150,000	$ 150,000
Derivative, fixed interest rate (as a percent)	2.197%
Interest rate swap 3
Debt Instrument [Line Items]
Derivative, notional amount	$ 100,000
Derivative, fixed interest rate (as a percent)	0.975%
Interest rate swap 4
Debt Instrument [Line Items]
Derivative, notional amount	$ 50,000
Derivative, fixed interest rate (as a percent)	0.60%
Interest rate swap 5
Debt Instrument [Line Items]
Derivative, notional amount	$ 100,000
Derivative, fixed interest rate (as a percent)	0.90%
Interest rate swap 6
Debt Instrument [Line Items]
Derivative, notional amount	$ 100,000
Derivative, fixed interest rate (as a percent)	0.597%
Interest rate swap 7
Debt Instrument [Line Items]
Derivative, notional amount	$ 50,000
Derivative, fixed interest rate (as a percent)	0.50%

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Fixed interest rate related to the interest rate derivative.

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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