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LEASE - Lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finance lease cost:
Amortization of right-of-use assets	$ 8,036	$ 18,900
Interest on lease liabilities	1,497	3,213
Operating lease cost	19,630	17,619
Short term lease cost	850	8,920
Total lease cost	$ 30,013	$ 48,652
Operating lease expenses			$ 20,905
Finance lease expenses			$ 24,696

X

- Definition

Amount of financing lease expense.

+ References

No definition available.

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X

- Definition

Amount of interest expense on finance lease liability.

+ References

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X

- Definition

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

+ References

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X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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No definition available.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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X

- Definition

Amount of operating lease expense. Excludes sublease income.

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X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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