The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

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Amount of cash inflow from lease payment, classified as operating activity.

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Amount, after allowance for credit loss, of net investment in sales-type lease.

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Accrued Liabilities and Other and Other Long-Term Liabilities Accrued Liabilities and Other and Other Long-Term Liabilities - Asset Retirement Obligations (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Vessels related to finance leases, at cost, less accumulated amortization		$ 2,012,772		$ 2,012,772		$ 2,105,372
Asset retirement obligation extinguishment gain (note 7)		32,950	$ 0	32,950	$ 0
Petrojarl Foinaven FPSO [Member]
Asset Retirement Obligation		10,700		10,700
Proceeds from Lease Payments	$ 67,000
Asset Retirement Obligation, Revision of Estimate		2,700
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss		$ 14,600		$ 14,600