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VESSELS AND EQUIPMENT UNDER FINANCE LEASE, NET - Lease Cost (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Depreciation of vessels under finance leases	$ (4,283)	$ (7,282)
Interest expense on obligations under finance leases	(2,002)	(4,833)
Contingent rental income (expense)	1,624	(8,270)
Gain on termination of vessel lease	0	7,409
Total finance lease expense, net	$ (4,661)	$ (12,976)

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Contingent rental income (expense)

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Amount of interest expense on finance lease liability.

+ References

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of gain (loss) on termination of lease before expiration of lease term.

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Amount of lease cost recognized by lessee for lease contract.

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