The actual hull coverage ratio of the Company as at period end.

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- Definition

The minimum liquidity required by covenants of certain debt currently held by the company. Liquidity is defined as cash, cash equivalents and undrawn committed revolving credit lines with at least six months to maturity.

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The minimum free liquidity and undrawn revolving credit line required by covenants of certain debt currently held by the Company, as a percentage of total debt.

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The minimum hull coverage ratio as required by certain covenants for debts held by the Company.

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Number of Third Party Valuators

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Number Of Vessels

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The number of vessels acquired by the entity during the period.

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Number of Lessors

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Number of Vessels with Purchase Option

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Sale Leaseback Transaction, Net Proceeds

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average discount rate for finance lease calculated at point in time.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

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Operating Leases and Obligations Related to Finance Leases - Additional Information (Details)	1 Months Ended		12 Months Ended
	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) valuator vessel lessor	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 15, 2023 vessel
Lessee, Lease, Description [Line Items]
Proceeds from financing related to sales and leaseback of vessels, net of issuance costs (note 10) \| $			$ 288,108,000	$ 140,226,000	$ 0
Number of Lessors \| lessor			27
Minimum Liquidity Covenant Requirement \| $			$ 35,000,000
Minimum Liquidity as a Percentage of Consolidated Debt Covenant Requirement			5.00%
Finance Lease, Weighted Average Remaining Lease Term			7.20%	4.80%
Payments to Acquire Property, Plant, and Equipment \| $			$ 15,430,000	$ 21,447,000	$ 16,025,000
Option to purchase between now and end of lease term
Lessee, Lease, Description [Line Items]
Number of Vessels with Purchase Option			15
Option to purchase starting in September 2023 until end of lease term
Lessee, Lease, Description [Line Items]
Number of Vessels with Purchase Option			4
Option to purchase starting in March 2024 until end of lease term
Lessee, Lease, Description [Line Items]
Number of Vessels with Purchase Option			8
Suezmax, Aframax and LR2 Vessels
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Undiscounted Excess Amount \| $			$ 158,700,000	$ 68,800,000
LR2 and Aframax Tankers
Lessee, Lease, Description [Line Items]
Number Of Vessels \| $			1	2
Minimum
Lessee, Lease, Description [Line Items]
Sale Leaseback Transaction, Lease Terms			six
Long-term Debt, Term			6 months
Number of Third Party Valuators \| valuator			2
Maximum
Lessee, Lease, Description [Line Items]
Sale Leaseback Transaction, Lease Terms			12
Finance Lease Obligations
Lessee, Lease, Description [Line Items]
Minimum Liquidity Covenant Requirement \| $			$ 35,000,000
Minimum Liquidity as a Percentage of Consolidated Debt Covenant Requirement			5.00%
Number of Third Party Valuators \| valuator			1
Finance Lease Obligations \| Minimum
Lessee, Lease, Description [Line Items]
Long-term Debt, Term			6 months
November 2021 Sale Leaseback \| Minimum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio				132.00%
November 2021 Sale Leaseback \| Maximum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio				140.00%
February 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			8
Proceeds from financing related to sales and leaseback of vessels, net of issuance costs (note 10) \| $		$ 177,300,000
July 2017, November 2018 and September 2021 Sale Leaseback \| Minimum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio				106.00%
July 2017, November 2018,September 2021 and March 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			18
Debt Covenant Minimum Hull Coverage Ratio			100.00%
July 2017, November 2018,September 2021 and March 2022 Sale Leaseback \| Minimum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio			173.00%
July 2017, November 2018,September 2021 and March 2022 Sale Leaseback \| Maximum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio			292.00%	134.00%
November 2021 and April 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			9
Debt Covenant Minimum Hull Coverage Ratio			105.00%
November 2021 and April 2022 Sale Leaseback \| Suezmax Tanker \| Subsequent Event [Member]
Lessee, Lease, Description [Line Items]
Number Of Vessels Acquired						1
November 2021 and April 2022 Sale Leaseback \| LR2 and Aframax Tankers \| Subsequent Event [Member]
Lessee, Lease, Description [Line Items]
Number Of Vessels Acquired						8
November 2021 and April 2022 Sale Leaseback \| Minimum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio			202.00%
November 2021 and April 2022 Sale Leaseback \| Maximum
Lessee, Lease, Description [Line Items]
Actual Hull Coverage Ratio			280.00%
July 2017, November 2018, November 2021 and April 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			15
September 2021 and March 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			12
July 2017, November 2018, September 2021, November 2021, March 2022 and April 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			27
July 2017, November 2018, September 2021, November 2021, March 2022 and April 2022 Sale Leaseback \| Suezmax, Aframax and LR2 Vessels
Lessee, Lease, Description [Line Items]
Number of Vessels with Purchase Option			27
April 2022 Sale Leaseback
Lessee, Lease, Description [Line Items]
Number Of Vessels			5
Proceeds from financing related to sales and leaseback of vessels, net of issuance costs (note 10) \| $	$ 114,000,000
Variable Interest Entity, Primary Beneficiary
Lessee, Lease, Description [Line Items]
Number of Lessors \| lessor			6