Teekay Tankers (TNK) 6-K 10 Nov 21 2021 Q3 Current report (foreign) Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2021
Document And Entity Information [Abstract]
Document Type	6-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	TEEKAY TANKERS LTD.
Entity Central Index Key	0001419945
Current Fiscal Year End Date	--12-31

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total revenues	$ 115,890	$ 170,240	$ 382,059	$ 758,632
Voyage expenses	(78,335)	(57,777)	(219,153)	(238,576)
Vessel operating expenses (notes 13b and 13c)	(39,103)	(46,336)	(125,280)	(143,203)
Time-charter hire expenses	(2,870)	(9,070)	(8,638)	(28,245)
Depreciation and amortization	(25,837)	(29,992)	(79,416)	(89,170)
General and administrative expenses (note 13b)	(10,542)	(9,887)	(34,245)	(28,957)
Write-down and loss on sale of assets (note15)	(697)	(44,973)	(88,098)	(45,164)
Restructuring Charges	0	(1,398)	0	(1,398)
(Loss) income from operations	(41,494)	(29,193)	(172,771)	183,919
Interest expense	(8,583)	(12,553)	(27,950)	(41,180)
Interest income	29	337	88	1,160
Realized and unrealized loss on derivative instruments (note 8)	(227)	(414)	(36)	(1,830)
Equity (loss) income	(873)	46	(2,061)	5,174
Other (expense) income (note 9)	(1,581)	(470)	(2,056)	1,613
Net (loss) income before income tax	(52,729)	(42,247)	(204,786)	148,856
Income tax recovery (expense) (note 10)	674	(2,187)	2,222	11,747
Net (loss) income	$ (52,055)	$ (44,434)	$ (202,564)	$ 160,603
Per common share amounts (note 14)
- Basic (loss) earnings per share	$ (1.54)	$ (1.32)	$ (5.98)	$ 4.76
- Diluted (loss) earnings per share	$ (1.54)	$ (1.32)	$ (5.98)	$ 4.73
Weighted-average number of Class A and Class B common stock outstanding (note 14)
- Basic	33,898,299	33,738,143	33,846,115	33,712,124
- Diluted	33,898,299	33,738,143	33,846,115	33,942,191
Voyage charter revenues
Total revenues	$ 107,079	$ 125,819	$ 333,278	$ 651,223
Time-charter [Member]
Total revenues	6,097	42,180	41,447	92,733
Other revenues
Total revenues	$ 2,714	$ 2,241	$ 7,334	$ 14,676

Unaudited Consolidated Balance

Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current
Cash and cash equivalents	$ 60,723	$ 97,232
Restricted cash – current (note 16)	2,476	2,779
Accounts receivable	28,308	36,202
Assets held for sale (note 15)	13,756	32,974
Due from affiliates (note 13c)	2,619	5,236
Bunker and lube oil inventory	49,817	34,606
Prepaid expenses	11,069	9,739
Accrued revenue	33,271	26,640
Total current assets	202,039	245,408
Restricted cash – long-term (note 16)	3,135	3,135
At cost, less accumulated depreciation of $292.7 million (2020 - $417.4 million) (note 15)	1,073,465	1,104,742
Vessels related to finance leases, at cost, less accumulated depreciation of $89.4 million (2020 - $124.4 million) (notes 7 and 15)	329,846	450,558
Operating Lease, Right-of-Use Asset	10,334	2,529
Total vessels and equipment	1,413,645	1,557,829
Investment in and advances to equity-accounted joint venture	25,000	28,561
Derivative assets (note 8)	181	0
Other non-current assets	1,654	897
Intangible assets at cost, less accumulated amortization of $4.1 million (2020 - $3.7 million)	1,612	1,989
Goodwill	2,426	2,426
Total Assets	1,649,692	1,840,245
Supplemental Balance Sheet Elements [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	292,700	417,400
Sale Leaseback Transaction, Accumulated Depreciation	89,400	124,400
Accumulated amortization on intangible assets	4,100	3,700
Current
Accounts payable	33,734	31,059
Accrued liabilities (notes 13c and 17)	37,135	55,055
Short-term debt (note 5)	20,000	10,000
Due to affiliates (note 13c)	9,831	3,123
Current portion of long-term debt (note 6)	34,399	10,858
Freight forward agreements	571	289
Current obligations related to finance leases (note 7)	20,005	78,476
Current portion of operating lease liabilities (note 7)	6,398	3,685
Other current liabilities (note 3)	2,411	4,574
Total current liabilities	164,484	197,119
Long-term debt (note 6)	343,130	232,103
Long-term obligations related to finance leases (note 7)	213,811	281,567
Long-term operating lease liabilities (note 7)	3,937	315
Derivative liabilities (note 8)	0	597
Other long-term liabilities (note 10)	46,559	49,642
Total liabilities	771,921	761,343
Equity
Common stock and additional paid-in capital (585.0 million shares authorized, 29.2 million Class A and 4.6 million Class B shares issued and outstanding as of September 30, 2021, and 585.0 million shares authorized, 29.1 million Class A and 4.6 million Class B shares issued and outstanding as at December 31, 2020) (note 12)	$ 1,300,653	$ 1,299,220
Common stock, shares authorized (in shares)	585,000,000	585,000,000
Accumulated deficit	$ (422,882)	$ (220,318)
Total equity	877,771	1,078,902
Total liabilities and equity	$ 1,649,692	$ 1,840,245
Common Class A [Member]
Equity
Common stock, shares authorized (in shares)	485,000,000	485,000,000
Common Stock, Shares, Outstanding	29,200,000	29,100,000
Common stock, shares issued (in shares)	29,200,000	29,100,000
Common Class B [Member]
Equity
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Outstanding	4,600,000	4,600,000
Common stock, shares issued (in shares)	4,600,000	4,600,000

Unaudited Consolidated Statem_2

Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net (Loss) Income	$ (44,434)	$ (202,564)	$ 160,603
Non-cash items:
Depreciation and amortization	29,992	79,416	89,170
Write-down and loss on sale of assets (note15)	44,973	88,098	45,164
Unrealized (gain) loss on derivative instruments (note 8)		(599)	1,948
Equity income	(46)	2,061	(5,174)
Income tax recovery (note 10)	2,187	(2,222)	(11,747)
Other		1,075	3,827
Change in operating assets and liabilities		(25,118)	72,629
Expenditures for dry docking		(23,313)	(9,405)
Net operating cash flow		(84,107)	347,811
FINANCING ACTIVITIES
Proceeds from short-term debt (note 5)		35,000	235,000
Prepayments of short-term debt (note 5)		(25,000)	(265,000)
Proceeds from long-term debt, net of issuance costs (note 6)		221,167	544,872
Scheduled repayments of long-term debt (note 6)		(8,422)	(10,366)
Prepayments of long-term debt (note 6)		(80,000)	(882,495)
Proceeds from financing related to sales and leaseback of vessels (note 7)		72,065	0
Scheduled repayments of obligations related to finance leases (note 7)		(12,783)	(18,716)
Prepayment of obligations related to finance leases (note 7)		(185,514)	0
Other		(225)	(562)
Net financing cash flow		16,288	(397,267)
INVESTING ACTIVITIES
Proceeds from sale of assets (2020 - net of cash sold of $2.1 million) (note 15)		44,675	85,892
Expenditures for vessels and equipment		(15,168)	(8,881)
Loan repayments from equity-accounted joint venture		1,500	4,650
Net investing cash flow		31,007	81,661
(Decrease) increase in cash, cash equivalents and restricted cash		(36,812)	32,205
Cash, cash equivalents and restricted cash, beginning of the period		103,146	96,790
Cash, cash equivalents and restricted cash, end of the period	128,995	66,334	128,995
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 2,100		2,100
Freight Tax [Member]
Non-cash items:
Income tax recovery (note 10)		$ (3,163)	$ (10,951)

Unaudited Consolidated Statem_3

Unaudited Consolidated Statement of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock and Additional Paid-in Capital	Common Stock and Additional Paid-in CapitalCommon Class A [Member]	Common Stock and Additional Paid-in CapitalCommon Class B [Member]	Accumulated Deficit
Balance at beginning of period (shares) at Dec. 31, 2019		33,655
Balance at beginning of period at Dec. 31, 2019	$ 989,920		$ 1,209,023	$ 88,532	$ (307,635)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Employee Benefit Plan		57
Equity-based compensation (note 12)	468		468
Net (Loss) Income	106,839				106,839
Balance at end of period (shares) at Mar. 31, 2020		33,712
Balance at end of period at Mar. 31, 2020	1,097,227		1,209,491	88,532	(200,796)
Balance at beginning of period (shares) at Dec. 31, 2019		33,655
Balance at beginning of period at Dec. 31, 2019	989,920		1,209,023	88,532	(307,635)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	160,603
Balance at end of period (shares) at Sep. 30, 2020		33,738
Balance at end of period at Sep. 30, 2020	1,151,789		1,210,289	88,532	(147,032)
Balance at beginning of period (shares) at Mar. 31, 2020		33,712
Balance at beginning of period at Mar. 31, 2020	1,097,227		1,209,491	88,532	(200,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Employee Benefit Plan		26
Equity-based compensation (note 12)	374		374
Net (Loss) Income	98,198				98,198
Balance at end of period (shares) at Jun. 30, 2020		33,738
Balance at end of period at Jun. 30, 2020	1,195,799		1,209,865	88,532	(102,598)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (note 12)	424		424
Net (Loss) Income	(44,434)				(44,434)
Balance at end of period (shares) at Sep. 30, 2020		33,738
Balance at end of period at Sep. 30, 2020	1,151,789		1,210,289	88,532	(147,032)
Balance at beginning of period (shares) at Dec. 31, 2020		33,738
Balance at beginning of period at Dec. 31, 2020	1,078,902		1,210,688	88,532	(220,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Employee Benefit Plan		17
Equity-based compensation (note 12)	341		341
Net (Loss) Income	(21,365)				(21,365)
Balance at end of period (shares) at Mar. 31, 2021		33,755
Balance at end of period at Mar. 31, 2021	1,057,878		1,211,029	88,532	(241,683)
Balance at beginning of period (shares) at Dec. 31, 2020		33,738
Balance at beginning of period at Dec. 31, 2020	1,078,902		1,210,688	88,532	(220,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	(202,564)
Balance at end of period (shares) at Sep. 30, 2021		33,789
Balance at end of period at Sep. 30, 2021	877,771		1,212,121	88,532	(422,882)
Balance at beginning of period (shares) at Mar. 31, 2021		33,755
Balance at beginning of period at Mar. 31, 2021	1,057,878		1,211,029	88,532	(241,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Employee Benefit Plan		24
Equity-based compensation (note 12)	699		699
Net (Loss) Income	(129,144)				(129,144)
Balance at end of period (shares) at Jun. 30, 2021		33,779
Balance at end of period at Jun. 30, 2021	929,433		1,211,728	88,532	(370,827)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Employee Benefit Plan		10
Equity-based compensation (note 12)	393		393
Net (Loss) Income	(52,055)				(52,055)
Balance at end of period (shares) at Sep. 30, 2021		33,789
Balance at end of period at Sep. 30, 2021	$ 877,771		$ 1,212,121	$ 88,532	$ (422,882)

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Total cash, cash equivalents and restricted cash, including cash, cash equivalents and restricted cash held for sale are as follows: As at As at As at As at September 30, 2021 December 31, 2020 September 30, 2020 December 31, 2019 $ $ $ $ Cash and cash equivalents 60,723 97,232 120,872 88,824 Restricted cash – current 2,476 2,779 4,686 3,071 Restricted cash – long-term 3,135 3,135 3,437 3,437 Cash and cash equivalents held for sale — — — 1,121 Restricted cash held for sale - current — — — 337 66,334 103,146 128,995 96,790 The Company maintains restricted cash deposits relating to certain FFAs (see note 8), for certain contracts related to the STS transfer business and for the LNG terminal management business, prior to its sale in April 2020 (see note 15). Attached to the LNG terminal management contracts were certain performance guarantees which were required to be issued by the Company and have now been terminated. The Company also maintains restricted cash deposits as required by the Company's obligations related to certain finance leases (see note 7). Non-cash items related to operating lease right-of-use assets and operating lease liabilities are as follows: For the nine months ended September 30, 2021 September 30, 2020 $ $ Leased assets obtained in exchange for new operating lease liabilities 10,509 835

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information Tables	9 Months Ended
	Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Total cash, cash equivalents and restricted cash, including cash, cash equivalents and restricted cash held for sale are as follows: As at As at As at As at September 30, 2021 December 31, 2020 September 30, 2020 December 31, 2019 $ $ $ $ Cash and cash equivalents 60,723 97,232 120,872 88,824 Restricted cash – current 2,476 2,779 4,686 3,071 Restricted cash – long-term 3,135 3,135 3,437 3,437 Cash and cash equivalents held for sale — — — 1,121 Restricted cash held for sale - current — — — 337 66,334 103,146 128,995 96,790 The Company maintains restricted cash deposits relating to certain FFAs (see note 8), for certain contracts related to the STS transfer business and for the LNG terminal management business, prior to its sale in April 2020 (see note 15). Attached to the LNG terminal management contracts were certain performance guarantees which were required to be issued by the Company and have now been terminated. The Company also maintains restricted cash deposits as required by the Company's obligations related to certain finance leases (see note 7). Non-cash items related to operating lease right-of-use assets and operating lease liabilities are as follows: For the nine months ended September 30, 2021 September 30, 2020 $ $ Leased assets obtained in exchange for new operating lease liabilities 10,509 835

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information Details - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Supplemental Cash Flow [Line Items]
Cash and cash equivalents	$ 60,723	$ 120,872	$ 97,232	$ 88,824
Restricted cash – current (note 16)	2,476	4,686	2,779	3,071
Restricted cash – long-term (note 17)	3,135	3,437	3,135	3,437
Cash, cash equivalents and restricted cash (note 16)	66,334	128,995	103,146	96,790
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	10,509	835
Cash and Cash Equivalents [Member]
Schedule Of Supplemental Cash Flow [Line Items]
Cash and cash equivalents	0	0	0	1,121
Restricted Cash [Member]
Schedule Of Supplemental Cash Flow [Line Items]
Restricted Cash and Cash Equivalents	$ 0	$ 0	$ 0	$ 337

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited interim consolidated financial statements (or unaudited consolidated financial statements ) have been prepared in accordance with United States generally accepted accounting principles (or GAAP ). These unaudited consolidated financial statements include the accounts of Teekay Tankers Ltd., its wholly-owned subsidiaries, equity-accounted joint venture and any variable interest entities (or VIEs ) of which it is the primary beneficiary (collectively, the Company ). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Certain information and footnote disclosures required by GAAP for complete annual financial statements have been omitted and, therefore, these unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2020, filed on Form 20-F with the U.S. Securities and Exchange Commission (or the SEC ) on April 1, 2021. In the opinion of management, these unaudited consolidated financial statements reflect all adjustments, consisting solely of a normal recurring nature, necessary to present fairly, in all material respects, the Company’s unaudited consolidated financial position, results of operations, cash flows and changes in total equity for the interim periods presented. The results of operations for the interim periods presented are not necessarily indicative of those for a full fiscal year. Intercompany balances and transactions have been eliminated upon consolidation. In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (or COVID-19 ) as a pandemic. Given the dynamic nature of these circumstances, the full extent to which the COVID-19 global pandemic may have direct or indirect impacts on the Company's business and the related financial reporting implications cannot be reasonably estimated at this time, although the pandemic could materially affect the Company's business, results of operations and financial condition in the future. COVID-19 resulted in a significant decline in global demand for oil during 2020; although oil demand has partially recovered in 2021, new outbreaks may continue to have a negative impact on oil demand in the future. As the Company's business is primarily the transportation of crude oil and refined petroleum products on behalf of customers, any significant decrease in demand for the cargo the Company transports could adversely affect demand for the Company's vessels and services. Spot tanker rates have come under pressure since mid-May 2020 as a result of significantly reduced oil demand due to COVID-19 and the subsequent decision by the OPEC+ group of oil producers to implement record oil supply cuts. Reduced oil production from other oil producing nations due to the impact of COVID-19, as well as the unwinding of floating storage and the delivery of newbuilding vessels to the world tanker fleet, has also contributed to the weakness in tanker rates. COVID-19 was also a contributing factor to the write-down of certain tankers during the nine months ended September 30, 2021 and the three and nine months ended September 30, 2020, as described in Note 15 - Write-down and Loss on Sale of Assets, and the reduction in certain tax accruals during the three and nine months ended September 30, 2020 as described in Note 10 - Income Tax Recovery (Expense).

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy	Recent Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes (or ASU 2019-12 ), as part of its initiative to reduce complexity in the accounting standards. The amendments in ASU 2019-12 eliminate certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences, among other changes. The Company adopted this update on January 1, 2021. The adoption did not have an impact on the Company's unaudited consolidated financial statements and related disclosures. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting (or ASU 2020-04 ). ASU 2020-04 provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as the London Interbank Offered Rate (or LIBOR ). The amendments in ASU 2020-04 apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued. The amendments in this ASU are effective through December 31, 2022. The Company is currently evaluating the effect of adopting this new guidance.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The Company’s primary source of revenue is from chartering its vessels (Aframax tankers, Suezmax tankers and Long Range 2 (or LR2 ) tankers) to its customers. The Company utilizes two primary forms of contracts, consisting of voyage charters and time-charters. The extent to which the Company employs its vessels on voyage charters versus time charters is dependent upon the Company’s chartering strategy and the availability of time charters. Spot market rates for voyage charters are volatile from period to period, whereas time charters provide a stable source of monthly revenue. The Company also provides ship-to-ship (or STS ) support services, which include managing the process of transferring cargo between seagoing ships positioned alongside each other, either stationary or underway, as well as management services to third-party owners of vessels. Prior to April 30, 2020, the Company managed liquefied natural gas (or LNG ) terminals and procured LNG-related goods for terminal owners and other customers. For descriptions of these types of contracts, see Item 18 - Financial Statements: Note 3 in the Company’s audited consolidated financial statements filed with its Annual Report on Form 20-F for the year ended December 31, 2020. On April 30, 2020, the Company completed the sale of the non-US portion of its STS support services business, as well as its LNG terminal management business (see note 15). The following table contains a breakdown of the Company's revenue by contract type for the three and nine months ended September 30, 2021 and September 30, 2020. All revenue is part of the Company's tanker segment, except for revenue for the non-US portion of the STS support services and LNG terminal management, consultancy, procurement, and other related services, which are part of the Company's previously existing STS transfer segment (see note 4). The Company’s lease income consists of the revenue from its voyage charters and time-charters. Three Months Ended Nine Months Ended 2021 2020 2021 2020 $ $ $ $ Voyage charter revenues Suezmax 59,651 51,134 177,388 302,839 Aframax 22,767 38,847 73,380 170,680 LR2 17,342 17,007 51,009 93,666 Full service lightering 7,319 18,831 31,501 84,038 Total 107,079 125,819 333,278 651,223 Time-charter revenues Suezmax — 35,133 20,390 81,700 Aframax 6,097 4,725 17,629 6,883 LR2 — 2,322 3,428 4,150 Total 6,097 42,180 41,447 92,733 Other revenues Ship-to-ship support services 1,676 777 3,777 8,619 Vessel management 1,038 1,464 3,557 5,665 LNG terminal management, consultancy, procurement and other — — — 392 Total 2,714 2,241 7,334 14,676 Total revenues 115,890 170,240 382,059 758,632 Charters-out As at September 30, 2021, two (December 31, 2020 - nine) of the Company’s vessels operated under fixed-rate time charter contracts, both of which are scheduled to expire in 2022. As at September 30, 2021, the minimum scheduled future revenues to be received by the Company under these time charters were approximately $4.7 million (remainder of 2021) and $5.2 million (2022) (December 31, 2020 - $45.3 million (2021) and $5.2 million (2022)). The hire payments should not be construed to reflect a forecast of total charter hire revenue for any of the periods. Future hire payments do not include hire payments generated from new contracts entered into after September 30, 2021, from unexercised option periods of contracts that existed on September 30, 2021 or from variable consideration, if any, under contracts. In addition, future hire payments presented above have been reduced by estimated off-hire time for required periodic maintenance and do not reflect the impact of revenue sharing arrangements whereby time-charter revenues are shared with other revenue sharing arrangement participants. Actual amounts may vary given future events such as unplanned vessel maintenance. Contract Liabilities As at September 30, 2021, the Company had $1.6 million (December 31, 2020 - $4.2 million) of advanced payments recognized as contract liabilities that are expected to be recognized as time-charter revenues in subsequent periods and which are included in other current liabilities on the Company's unaudited consolidated balance sheets.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting On April 30, 2020, the Company completed the sale of the non-US portion of its STS support services business, as well as its LNG terminal management business. Following the sale, the Company's remaining STS support operations were integrated into the Company's tanker business. As a result, effective April 30, 2020, the Company has one reportable segment. The Company’s segment information for all periods prior to the sale and reorganization has been retroactively adjusted whereby the remaining STS support operations have been reallocated from the STS transfer segment to the tanker segment. Consequently, the Company’s tanker segment now consists of the operation of all of its tankers, including the operations from those tankers employed on full service lightering contracts, and the US based STS support service operations that the Company retained, including its lightering support services provided as part of full service lightering operations. The Company’s STS transfer segment consisted of the Company’s non-US lightering support services, LNG terminal management, consultancy, procurement, and other related services which were sold as of April 30, 2020. Segment results are evaluated based on income from operations. The accounting policies applied to the reportable segments are the same as those used in the preparation of the Company’s unaudited consolidated financial statements. The following table includes results for the Company’s revenues and income from operations by segment for the nine months ended September 30, 2020. No results are included for the three months ended September 30, 2020 and the three and nine months ended September 30, 2021 as the Company only had one reportable segment during these periods.

Short-Term Debt

Short-Term Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Short-term Debt	Short-Term Debt In November 2018, Teekay Tankers Chartering Pte. Ltd. (or TTCL ), a wholly-owned subsidiary of the Company, entered into a working capital revolving loan facility (or the Working Capital Loan ), which initially provided available aggregate borrowings of up to $40.0 million for TTCL, and had an initial maturity date in May 2019, subject to extension as described below. The maximum available aggregate borrowings were subsequently increased to $80.0 million, effective December 2019. The amount available for drawdown is limited to a percentage of certain receivables and accrued revenue, which is assessed weekly. As at September 30, 2021, the next maturity date of the Working Capital Loan was in November 2021, and subsequently has been extended to May 2022. The Working Capital Loan maturity date is continually extended for further periods of six months thereafter unless and until the lender gives notice in writing that no further extensions shall occur. Proceeds of the Working Capital Loan are used to provide working capital in relation to certain vessels subject to the revenue sharing agreements (or RSAs). Interest payments are based on LIBOR plus a margin of 3.5%. The Working Capital Loan is collateralized by the assets of TTCL. The Working Capital Loan requires the Company to maintain its paid-in capital contribution under the RSAs and the retained distributions of the RSA counterparties in an amount equal to the greater of (a) an amount equal to the minimum average capital contributed by the RSA counterparties per vessel in respect of the RSA (including cash, bunkers or other working capital contributions and amounts accrued to the RSA counterparties but unpaid) and (b) a minimum capital contribution ranging from $20.0 million to $30.0 million based on the amount borrowed. As at September 30, 2021, $20.0 million (December 31, 2020 - $10.0 million) was owing under this facility, the aggregate available borrowings were $34.3 million (December 31, 2020 - $32.0 million) and the interest rate on the facility was 3.6% (December 31, 2020 - 3.6%). As at September 30, 2021, the Company was in compliance with all covenants in respect of this facility.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt Disclosure	Long-Term Debt As at As at September 30, 2021 December 31, 2020 $ $ Revolving credit facility due through 2024 326,167 185,000 Term loan due in 2023 56,146 64,568 Total principal 382,313 249,568 Less: unamortized discount and debt issuance costs (4,784) (6,607) Total debt 377,529 242,961 Less: current portion (34,399) (10,858) Long-term portion 343,130 232,103 As at September 30, 2021, the Company had one revolving credit facility (or the 2020 Revolver ), which, as at such date, provided for aggregate borrowings of up to $391.2 million (December 31, 2020 - $438.4 million), of which $65.0 million (December 31, 2020 - $253.4 million) was undrawn. Interest payments are based on LIBOR plus a margin, which was 2.40% as at September 30, 2021 (December 31, 2020 - 2.40%). The total amount available under the 2020 Revolver decreases by $44.2 million (remainder of 2021), $80.4 million (2022), $65.3 million (2023) and $201.3 million (2024). The 2020 Revolver is collateralized by 30 of the Company's vessels, together with other related security. As at September 30, 2021, the Company also had one term loan (or the 2020 Term Loan ) outstanding, which totaled $56.1 million (December 31, 2020 - $64.6 million). Interest payments are based on LIBOR plus a margin, which was 2.25% as at September 30, 2021 (December 31, 2020 - 2.25%). The term loan reduces in quarterly payments and has a balloon repayment due at maturity in 2023. The 2020 Term Loan is collateralized by four of the Company's vessels, together with other related security. The 2020 Revolver and the 2020 Term Loan require the Company to maintain a minimum hull coverage ratio of 125% of the total outstanding drawn balance and 125% of the total outstanding principal balance, respectively, for the facility periods. Such requirements are assessed on a semi-annual basis with reference to vessel valuations compiled by two or more agreed upon third parties. Should the ratios drop below the required amounts, the lender may request that the Company either prepay a portion of the loan in the amount of the shortfall or provide additional collateral in the amount of the shortfall, at the Company's option. As at September 30, 2021, the hull coverage ratios were 212% and 177% for the 2020 Revolver and 2020 Term Loan, respectively. A decline in the tanker market could negatively affect these ratios. In addition, the Company is required to maintain a minimum liquidity (cash, cash equivalents and undrawn committed revolving credit lines with at least six months to maturity) of the greater of $35.0 million and at least 5% of the Company's total consolidated debt and obligations related to finance leases. As at September 30, 2021, the Company was in compliance with all covenants in respect of the 2020 Revolver and the 2020 Term Loan. The weighted-average interest rate on the Company’s long-term debt as at September 30, 2021 was 2.5% (December 31, 2020 - 2.6%). This rate does not reflect the effect of the Company’s interest rate swap agreement (see note 8). The aggregate annual long-term debt principal repayments required to be made by the Company under the 2020 Revolver and the 2020 Term Loan subsequent to September 30, 2021 are $2.8 million (remainder of 2021), $70.8 million (2022), $107.4 million (2023) and $201.3 million (2024).

Operating Leases and Obligation

Operating Leases and Obligations Related to Finance Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lessee, Operating Leases [Text Block]	Operating Leases The Company charters-in vessels from other vessel owners on time-charter contracts, whereby the vessel owner provides use and technical operation of the vessel for the Company. A time charter-in contract is typically for a fixed period of time, although in certain cases the Company may have the option to extend the charter. The Company typically pays the owner a daily hire rate that is fixed over the duration of the charter. The Company is generally not required to pay the daily hire rate during periods the vessel is not able to operate. As at September 30, 2021, minimum commitments to be incurred by the Company under time charter-in contracts were approximately $5.2 million (remainder of 2021), $24.8 million (2022), $18.2 million (2023), $6.8 million (2024), $6.8 million (2025) and $24.5 million (thereafter), including one Aframax tanker expected to be delivered to the Company in the fourth quarter of 2021 to commence a two seven
Lessee, Finance Leases	Obligations Related to Finance Leases As at As at September 30, 2021 December 31, 2020 $ $ Total obligations related to finance leases 233,816 360,043 Less: current portion (20,005) (78,476) Long-term obligations related to finance leases 213,811 281,567 As at September 30, 2021, the Company had sale-leaseback financing transactions with financial institutions relating to 10 of the Company's vessels, including four vessels, which sale-leaseback financing transactions were completed in September 2021. In November 2021, the Company completed sale-leaseback financing transactions with a financial institution relating to four additional vessels (see note 19). Under the sale-leaseback arrangements completed as of September 30, 2021, the Company transferred the vessels to subsidiaries of the financial institutions (collectively, the Lessors ) and leased the vessels back from the Lessors on bareboat charters ranging from eight to 12-year terms ending between 2028 and 2030. The Company has the option to purchase each of the 10 vessels, four of which can be purchased between now and the end of their respective lease terms, two of which can be purchased starting in November 2021 until the end of their respective lease terms, and the remaining four of which can be purchased starting in September 2023 until the end of their respective lease terms. The bareboat charters related to all 10 of these vessels require that the Company maintain a minimum liquidity (cash, cash equivalents and undrawn committed revolving credit lines with at least six months to maturity) of the greater of $35.0 million and at least 5.0% of the Company's consolidated debt and obligations related to finance leases. Each of the bareboat charters requires the Company to maintain, for each vessel, a minimum hull coverage ratio of 100% of the total outstanding principal balance. As at September 30, 2021, these ratios ranged from 104% to 130% (December 31, 2020 - ranged from 121% to 156%). For six of the bareboat charters, should any of these ratios drop below the required amount, the lessor may request that the Company prepay additional charter hire. For the remaining four bareboat charters, should any of these ratios drop below the required amount, the lessor may request that the Company either prepay additional charter hire in the amount of the shortfall or, in certain circumstances, make a payment to reduce the outstanding principal balance or provide additional collateral satisfactory to the relevant lessor in the amount of the shortfall, in each case to restore compliance with the relevant ratio. The requirements of the bareboat charters are assessed annually with reference to vessel valuations compiled by one or more agreed upon third parties. As at September 30, 2021, the Company was in compliance with all covenants in respect of its obligations related to finance leases. During 2021, the Company completed the repurchase of eight vessels from one lessor. In April 2021, the Company was served with a claim from the counterparty of the bareboat charters relating to these vessels, for reimbursement of breakage costs in respect of interest rate swaps that were entered into by the counterparty at the time of the original transaction in connection with the counterparty's then-underlying financing. The Company filed a defense to this claim in June 2021, rejecting the claim that the Company is responsible for paying these breakage cost reimbursements under the terms of the bareboat charters. As of September 30, 2021, the amount of breakage costs being claimed was $7.3 million. No loss provision in respect of this claim has been made by the Company based on its assessment of the merits of the claim. The weighted-average interest rate on the Company’s obligations related to finance leases as at September 30, 2021 was 5.3% (December 31, 2020 - 7.8%). As at September 30, 2021, the Company's total remaining commitments related to the financial liabilities of these vessels were approximately $297.4 million (December 31, 2020 - $480.9 million), including imputed interest of $62.8 million (December 31, 2020 - $120.9 million), repayable from 2021 through 2030, as indicated below: Commitments September 30, 2021 Year $ Remainder of 2021 8,172 2022 31,937 2023 31,695 2024 31,517 2025 31,209 Thereafter 162,852

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Interest rate swap agreement The Company uses derivative instruments in accordance with its overall risk management policies. The Company enters into interest rate swap agreements which exchange a receipt of floating interest for a payment of fixed interest to reduce the Company’s exposure to interest rate variability on its outstanding floating-rate debt. The Company has not designated, for accounting purposes, its interest rate swap as a cash flow hedge of its U.S. Dollar LIBOR-denominated borrowings. In March 2020, the Company entered into an interest rate swap agreement which is scheduled to mature in December 2024. The following summarizes the Company's interest rate swap agreement as at September 30, 2021: Interest Rate Notional Amount Fair Value /Carrying Amount of Liability Remaining Term Fixed Swap Rate Index $ $ (years) (%) (1) LIBOR-Based Debt: U.S. Dollar-denominated interest rate swap agreement LIBOR 50,000 (120) 3.3 0.76 (1) Excludes the margin the Company pays on its variable-rate long-term debt, which, as of September 30, 2021, ranged from 2.25% to 2.40%. The Company is potentially exposed to credit loss in the event of non-performance by the counterparty to the interest rate swap agreements in the event that the fair value results in an asset being recorded. In order to minimize counterparty risk, the Company only enters into interest rate swap agreements with counterparties that are rated A– or better by Standard & Poor’s or A3 or better by Moody’s at the time transactions are entered into. Forward freight agreements The Company uses forward freight agreements (or FFAs ) in non-hedge-related transactions to increase or decrease its exposure to spot market rates, within defined limits. Net gains and losses from FFAs are recorded within realized and unrealized loss on derivative instruments in the Company's unaudited consolidated statements of (loss) income. Tabular Disclosure The following table presents the location and fair value amounts of derivative instruments, segregated by type of contract, on the Company’s unaudited consolidated balance sheets. Derivative Assets Current Portion of Derivative Liabilities Derivative Liabilities $ $ $ As at September 30, 2021 Interest rate swap agreement 181 (301) — Forward freight agreements — (270) — 181 (571) — As at December 31, 2020 Interest rate swap agreement — (289) (597) — (289) (597) Realized and unrealized (losses) gains relating to the interest rate swaps and FFAs are recognized in earnings and reported in realized and unrealized loss on derivative instruments in the Company’s unaudited consolidated statements of (loss) income as follows: Three Months Ended Three Months Ended September 30, 2021 September 30, 2020 Realized Losses Unrealized Gains Total Realized Losses Unrealized Gains (Losses) Total $ $ $ $ $ $ Interest rate swap agreement (79) 75 (4) (58) 49 (9) Forward freight agreements (359) 136 (223) (184) (221) (405) (438) 211 (227) (242) (172) (414) Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 Realized Losses Unrealized Gains (Losses) Total Realized Gains (Losses) Unrealized Losses Total $ $ $ $ $ $ Interest rate swap agreement (216) 766 550 551 (1,648) (1,097) Forward freight agreements (419) (167) (586) (433) (300) (733) (635) 599 (36) 118 (1,948) (1,830)

Other (Expense) Income

Other (Expense) Income	9 Months Ended
	Sep. 30, 2021
Other Nonoperating Income [Abstract]
Other Nonoperating Income and Expense [Text Block]	Other (Expense) Income The components of other (expense) income are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Foreign exchange gain (loss) 143 (514) 130 534 Other (expense) income (1,724) 44 (2,186) 1,079 Total (1,581) (470) (2,056) 1,613

Income Tax Recovery

Income Tax Recovery	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Tax Recovery (Expense) The following table reflects changes in uncertain tax positions relating to freight tax liabilities, which are recorded in other long-term liabilities on the Company's unaudited consolidated balance sheets: Nine Months Ended September 30, 2021 2020 Balance of unrecognized tax benefits as at January 1 49,124 49,579 Increases for positions related to the current year 2,890 2,290 Increases for positions related to prior years 3,955 2,906 Decreases for positions taken in prior years — (15,164) Settlements with tax authority — (8,556) Decreases related to statute of limitations (9,988) (961) Foreign exchange gain (184) (710) Balance of unrecognized tax benefits as at September 30 45,797 29,384 Included in the Company's current income tax recovery (expense) are provisions for uncertain tax positions relating to freight taxes. Positions relating to freight taxes can vary each year depending on the trading patterns of the Company's vessels. During the nine months ended September 30, 2020, the Company secured an agreement with a tax authority, which was based in part on an initiative of the tax authority in response to the COVID-19 global pandemic and included the waiver of interest and penalties on unpaid taxes. As a result, the Company reduced its freight tax liabilities for this jurisdiction by $15.2 million to $8.6 million, of which $7.7 million was paid in August 2020 and $0.9 million was paid in June 2021, with respect to open tax years up to and including 2020. The Company does not presently anticipate that its provisions for these uncertain tax positions will significantly increase in the next 12 months; however, this is dependent on the jurisdictions in which vessel trading activity occurs. The Company reviews its freight tax obligations on a regular basis and may update its assessment of its tax positions based on available information at that time. Such information may include legal advice as to applicability of freight taxes in relevant jurisdictions. Freight tax regulations are subject to change and interpretation; therefore, the amounts recorded by the Company may change accordingly.

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Financial Instruments	Financial Instruments Fair Value Measurements For a description of how the Company estimates fair value and for a description of the fair value hierarchy levels, see Item 18 - Financial Statements: Note 12 to the Company’s audited consolidated financial statements filed with its Annual Report on Form 20-F for the year ended December 31, 2020. The following table includes the estimated fair value, carrying value and categorization using the fair value hierarchy of those assets and liabilities that are measured at their estimated fair value on a recurring and non-recurring basis, as well as certain financial instruments that are not measured at fair value on a recurring basis. September 30, 2021 December 31, 2020 Fair Value Hierarchy Level Carrying Amount Asset / (Liability) $ Fair Value Asset / (Liability) $ Carrying Amount Asset / (Liability) $ Fair Value Asset / (Liability) $ Recurring: Cash, cash equivalents and restricted cash (note 16) Level 1 66,334 66,334 103,146 103,146 Derivative instruments (note 8) Interest rate swap agreement Level 2 (120) (120) (886) (886) Freight forward agreements Level 2 (270) (270) — — Non-recurring: Operating lease right-of-use assets Level 2 — — 1,799 1,799 Vessels and equipment ( note 15 ) Level 2 — — 59,250 59,250 Assets held for sale ( note 15 ) Level 2 12,740 12,740 31,680 31,680 Other: Short-term debt (note 5) Level 2 (20,000) (20,000) (10,000) (10,000) Advances to equity-accounted joint venture Note (1) 3,780 Note (1) 5,280 Note (1) Long-term debt, including current portion (note 6) Level 2 (377,529) (382,152) (242,961) (248,738) Obligations related to finance leases, including current portion (note 7) Level 2 (233,816) (247,130) (360,043) (411,740) (1) The advances to its equity-accounted joint venture, together with the Company’s investment in the equity-accounted joint venture, form the net aggregate carrying value of the Company’s interests in the equity-accounted joint venture in these unaudited consolidated financial statements. The fair values of the individual components of such aggregate interests as at September 30, 2021 and December 31, 2020 were not determinable.

Capital Stock and Equity-Based

Capital Stock and Equity-Based Compensation	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Capital Stock and Stock-Based Compensation	Capital Stock and Equity-Based Compensation The authorized capital stock of the Company at September 30, 2021 was 100.0 million shares of Preferred Stock (December 31, 2020 - 100.0 million shares), with a par value of $0.01 per share (December 31, 2020 - $0.01 per share), 485.0 million shares of Class A common stock (December 31, 2020 - 485.0 million shares), with a par value of $0.01 per share (December 31, 2020 - $0.01 per share), and 100.0 million shares of Class B common stock (December 31, 2020 - 100.0 million shares), with a par value of $0.01 per share (December 31, 2020 - $0.01 per share). A share of Class A common stock entitles the holder to one vote per share while a share of Class B common stock entitles the holder to five votes per share, subject to a 49% aggregate Class B common stock voting power maximum. As of September 30, 2021, the Company had 29.2 million shares of Class A common stock (December 31, 2020 – 29.1 million), 4.6 million shares of Class B common stock (December 31, 2020 – 4.6 million) and no shares of preferred stock (December 31, 2020 – nil) issued and outstanding. During the three and nine months ended September 30, 2021 and 2020, the Company recognized $0.5 million and $1.4 million (2020 - $0.4 million and $1.3 million), respectively, of expenses related to restricted stock units and stock options in general and administrative expenses. During the nine months ended September 30, 2021, a total of 56.0 thousand restricted stock units (2020 - 78.3 thousand) with a market value of $0.8 million (2020 - $1.3 million) vested and 35.7 thousand shares (2020 - 44.8 thousand shares) of Class A common stock, net of withholding taxes, were concurrently issued to the grantees.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Management Fee - Related and Other a. The Company's operations are conducted in part by its subsidiaries, which receive services from Teekay Corporation's (or Teekay's) wholly-owned subsidiary, Teekay Shipping Ltd. (or the Manager ) and its affiliates. The Manager provides various services under a long-term management agreement (the Management Agreement ), as disclosed below. b. Amounts received (paid) by the Company for related party transactions for the periods indicated were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Vessel operating expenses - technical management fee (i) (252) (248) (756) (744) Strategic and administrative service fees (ii) (8,231) (7,453) (26,471) (22,568) Secondment fees (iii) (66) (95) (221) (337) Technical management fee and service revenues (iv)(v) 175 172 519 519 (i) The cost of ship management services provided by a third party has been presented as vessel operating expenses on the Company's unaudited consolidated statements of (loss) income. The Company paid such third party technical management fees to the Manager in relation to certain former Tanker Investments Ltd. vessels. (ii) The Manager’s strategic and administrative service fees have been presented in general and administrative expenses, except for fees related to technical management services, which have been presented in vessel operating expenses on the Company’s unaudited consolidated statements of (loss) income. The Company’s executive officers are employees of Teekay or subsidiaries thereof, and their compensation (other than any awards under the Company’s long-term incentive plan) is set and paid by Teekay or such other subsidiaries. The Company compensates Teekay for time spent by its executive officers on the Company’s management matters through the strategic portion of the management fee. (iii) The Company pays secondment fees for services provided by some employees of Teekay. Secondment fees have been presented in general and administrative expenses, except for fees related to technical management services, which have been presented in vessel operating expenses on the Company's unaudited consolidated statements of (loss) income. (iv) The Company receives reimbursements from Teekay for the provision of technical management services. These reimbursements have been presented in general and administrative expenses on the Company's unaudited consolidated statements of (loss) income. (v) The Company recorded service revenues relating to Teekay Tanker Operations Limited's (or TTOL's ) provision of certain commercial services to the counterparties in the agreements. c. The Manager and other subsidiaries of Teekay collect revenues and remit payments for expenses incurred by the Company’s vessels. Such amounts, which are presented on the Company’s unaudited consolidated balance sheets in "due from affiliates" or "due to affiliates," as applicable, are without interest or stated terms of repayment. In addition, $2.2 million and $9.0 million were payable as crewing and manning costs as at September 30, 2021 and December 31, 2020, respectively, and such amounts are included in accrued liabilities on the Company's unaudited consolidated balance sheets. These crewing and manning costs will be payable as reimbursement to the Manager once they are paid by the Manager to the vessels' crew.

(Loss) Earnings Per Share

(Loss) Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Loss Per Share	4. (Loss) Earnings Per Share The net (loss) earnings available for common shareholders and (loss) earnings per common share are presented in the table below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Net (loss) income (52,055) (44,434) (202,564) 160,603 Weighted average number of common shares - basic (1) 33,898,299 33,738,143 33,846,115 33,712,124 Dilutive effect of stock-based awards — — — 230,067 Weighted average number of common shares - diluted 33,898,299 33,738,143 33,846,115 33,942,191 (Loss) earnings per common share: – Basic (1.54) (1.32) (5.98) 4.76 – Diluted (1.54) (1.32) (5.98) 4.73 (1) Includes unissued common shares related to non-forfeitable stock-based compensation.

(Write-down) and Gain (Loss) on

(Write-down) and Gain (Loss) on Sale of Assets	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Sale of Assets and Asset Impairment Charges [Text Block]	Write-down and Loss on Sale of Assets During the three and nine months ended September 30, 2021, the Company completed the sale of one Aframax tanker for $11.7 million, with a gain on sale of $0.2 million. The Company's unaudited consolidated statement of (loss) income for the nine months ended September 30, 2021 includes a write-down of $1.7 million related to this vessel, which was written down to its estimated sales price, less estimated selling costs. D uring the nine months ended September 30, 2021, the Company completed the sale of an additional two Aframax tankers for a total price of $32.0 million. Both of these vessels were written-down to their agreed sales price less selling costs and classified as held for sale on the Company's consolidated balance sheet as at December 31, 2020. During the nine months ended September 30, 2021, the carrying values of three Suezmax tankers, three LR2 tankers and one Aframax tanker were written down, and during the three and nine months ended September 30, 2020, the carrying values of five Aframax tankers were written down. The vessels were written down to their estimated fair values, using appraised values provided by third parties. The write-downs were primarily due to a weaker near-term tanker market outlook and a reduction in charter rates as a result of the current economic environment, which has been impacted by the COVID-19 global pandemic. The Company's consolidated unaudited statements of (loss) income for the nine months ended September 30, 2021, and for the three and nine months ended September 30, 2020, include write-downs totaling $85.0 million and $43.5 million, respectively, related to these vessels. As at September 30, 2021, the Company classified one Aframax tanker, including its bunker and lube oil inventory, as held for sale on the Company's unaudited consolidated balance sheet. The vessel was written down to its estimated sales price, less estimated selling costs. The Company's unaudited consolidated statement of (loss) income for the three and nine months ended September 30, 2021 includes a write-down of $0.9 million related to this vessel. During the nine months ended September 30, 2021, and three and nine months ended September 30, 2020, the Company recorded write-downs of $0.7 million, $1.4 million and $2.1 million, respectively, on its operating lease right-of-use assets, which were written-down to their estimated fair values, based on prevailing charter rates for comparable periods, due to a reduction in these charter rates. The Company's unaudited consolidated statement of (loss) income for the nine months ended September 30, 2020 includes a gain of $3.1 million relating to the completion of the sale of the non-US portion of its STS support services business, as well as its LNG terminal management business for proceeds of $27.1 million, including an adjustment of $1.1 million for the final amounts of cash and other working capital present on the closing date.

Restructuring and Related Activ

Restructuring and Related Activities	9 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure	Restructuring Charge During the three and nine months ended September 2020, the Company recognized restructuring charges of $1.4 million. The restructuring charges related to estimated severance costs resulting from organizational changes partially related to the sale of the non-US portion of the Company's STS support services business in April 2020 (see note 15). As at September 30, 2021 and December 31, 2020, restructuring liabilities of $nil and $1.0 million, respectively, were recognized in accrued liabilities on the Company's unaudited consolidated balance sheets.

Liquidity

Liquidity	9 Months Ended
	Sep. 30, 2021
Liquidity [Abstract]
Substantial Doubt about Going Concern [Text Block]	18. Liquidity Management is required to assess if the Company will have sufficient liquidity to continue as a going concern for the one-year period following the issuance of these unaudited consolidated financial statements. Based on the Company's liquidity as at the date these unaudited consolidated financial statements were issued, including the liquidity generated from the completion of the sale-leaseback of four vessels in November 2021 (see note 19), the Company's working capital loan that is expected to be renewed in May 2022 and from the expected cash flows from Company's operations over the following year, the Company estimates that it will have sufficient liquidity to meet its minimum liquidity requirements under its financial covenants and to continue as a going concern for at least a one-year period following the issuance of these unaudited consolidated financial statements.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent EventsOn November 3, 2021, the Company completed a $68.9 million sale-leaseback financing transaction related to four Aframax vessels. Pursuant to this arrangement, the Company transferred the vessels to subsidiaries of a financial institution and leased the vessels back on seven-year bareboat charters. The Company is required to repurchase the vessels upon maturity of the bareboat charters and has the option to repurchase any of the vessels at any earlier date. These bareboat charters require that the Company maintain a minimum liquidity consistent with the Company’s other vessels financed on similar arrangements (see note 7) and, for each vessel, a minimum hull coverage ratio of 105% of the total outstanding principal balance.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table contains a breakdown of the Company's revenue by contract type for the three and nine months ended September 30, 2021 and September 30, 2020. All revenue is part of the Company's tanker segment, except for revenue for the non-US portion of the STS support services and LNG terminal management, consultancy, procurement, and other related services, which are part of the Company's previously existing STS transfer segment (see note 4). The Company’s lease income consists of the revenue from its voyage charters and time-charters. Three Months Ended Nine Months Ended 2021 2020 2021 2020 $ $ $ $ Voyage charter revenues Suezmax 59,651 51,134 177,388 302,839 Aframax 22,767 38,847 73,380 170,680 LR2 17,342 17,007 51,009 93,666 Full service lightering 7,319 18,831 31,501 84,038 Total 107,079 125,819 333,278 651,223 Time-charter revenues Suezmax — 35,133 20,390 81,700 Aframax 6,097 4,725 17,629 6,883 LR2 — 2,322 3,428 4,150 Total 6,097 42,180 41,447 92,733 Other revenues Ship-to-ship support services 1,676 777 3,777 8,619 Vessel management 1,038 1,464 3,557 5,665 LNG terminal management, consultancy, procurement and other — — — 392 Total 2,714 2,241 7,334 14,676 Total revenues 115,890 170,240 382,059 758,632

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of Company's Revenue and Income from Operations by Segment	Nine Months Ended September 30, 2020 Tanker Segment STS Transfer Segment Total $ $ $ Revenues (1) 751,640 6,992 758,632 Voyage expenses (238,576) — (238,576) Vessel operating expenses (137,263) (5,940) (143,203) Time-charter hire expenses (28,245) — (28,245) Depreciation and amortization (88,677) (493) (89,170) General and administrative expenses (2) (28,330) (627) (28,957) (Loss) gain on sale of assets and (write-down) of assets (48,245) 3,081 (45,164) Restructuring charge (1,398) — (1,398) Income from operations 180,906 3,013 183,919 Equity income 5,174 — 5,174 (1) Revenues earned from the STS transfer segment are reflected in Other Revenues in the Company's unaudited consolidated statements of (loss) income. (2) Includes direct general and administrative expenses and indirect general and administrative expenses (allocated to each segment based on estimated use of corporate resources).

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Summary of Long-Term Debt	As at As at September 30, 2021 December 31, 2020 $ $ Revolving credit facility due through 2024 326,167 185,000 Term loan due in 2023 56,146 64,568 Total principal 382,313 249,568 Less: unamortized discount and debt issuance costs (4,784) (6,607) Total debt 377,529 242,961 Less: current portion (34,399) (10,858) Long-term portion 343,130 232,103

Operating Leases and Obligati_2

Operating Leases and Obligations Related to Finance Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Obligations Related to Finance Leases [Table Text Block]	As at As at September 30, 2021 December 31, 2020 $ $ Total obligations related to finance leases 233,816 360,043 Less: current portion (20,005) (78,476) Long-term obligations related to finance leases 213,811 281,567
Schedule of Future Minimum Lease Payments for Finance Leases [Table Text Block]	As at September 30, 2021, the Company's total remaining commitments related to the financial liabilities of these vessels were approximately $297.4 million (December 31, 2020 - $480.9 million), including imputed interest of $62.8 million (December 31, 2020 - $120.9 million), repayable from 2021 through 2030, as indicated below: Commitments September 30, 2021 Year $ Remainder of 2021 8,172 2022 31,937 2023 31,695 2024 31,517 2025 31,209 Thereafter 162,852

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swap Positions	The following summarizes the Company's interest rate swap agreement as at September 30, 2021: Interest Rate Notional Amount Fair Value /Carrying Amount of Liability Remaining Term Fixed Swap Rate Index $ $ (years) (%) (1) LIBOR-Based Debt: U.S. Dollar-denominated interest rate swap agreement LIBOR 50,000 (120) 3.3 0.76 (1) Excludes the margin the Company pays on its variable-rate long-term debt, which, as of September 30, 2021, ranged from 2.25% to 2.40%.
Schedule of Derivative Instruments	The following table presents the location and fair value amounts of derivative instruments, segregated by type of contract, on the Company’s unaudited consolidated balance sheets. Derivative Assets Current Portion of Derivative Liabilities Derivative Liabilities $ $ $ As at September 30, 2021 Interest rate swap agreement 181 (301) — Forward freight agreements — (270) — 181 (571) — As at December 31, 2020 Interest rate swap agreement — (289) (597) — (289) (597)
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location	Realized and unrealized (losses) gains relating to the interest rate swaps and FFAs are recognized in earnings and reported in realized and unrealized loss on derivative instruments in the Company’s unaudited consolidated statements of (loss) income as follows: Three Months Ended Three Months Ended September 30, 2021 September 30, 2020 Realized Losses Unrealized Gains Total Realized Losses Unrealized Gains (Losses) Total $ $ $ $ $ $ Interest rate swap agreement (79) 75 (4) (58) 49 (9) Forward freight agreements (359) 136 (223) (184) (221) (405) (438) 211 (227) (242) (172) (414) Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 Realized Losses Unrealized Gains (Losses) Total Realized Gains (Losses) Unrealized Losses Total $ $ $ $ $ $ Interest rate swap agreement (216) 766 550 551 (1,648) (1,097) Forward freight agreements (419) (167) (586) (433) (300) (733) (635) 599 (36) 118 (1,948) (1,830)

Other (Expense) Income (Tables)

Other (Expense) Income (Tables)	9 Months Ended
	Sep. 30, 2021
Other Nonoperating Income [Abstract]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	The components of other (expense) income are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Foreign exchange gain (loss) 143 (514) 130 534 Other (expense) income (1,724) 44 (2,186) 1,079 Total (1,581) (470) (2,056) 1,613

Income Tax Recovery (Tables)

Income Tax Recovery (Tables)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Summary of Income Tax Contingencies	The following table reflects changes in uncertain tax positions relating to freight tax liabilities, which are recorded in other long-term liabilities on the Company's unaudited consolidated balance sheets: Nine Months Ended September 30, 2021 2020 Balance of unrecognized tax benefits as at January 1 49,124 49,579 Increases for positions related to the current year 2,890 2,290 Increases for positions related to prior years 3,955 2,906 Decreases for positions taken in prior years — (15,164) Settlements with tax authority — (8,556) Decreases related to statute of limitations (9,988) (961) Foreign exchange gain (184) (710) Balance of unrecognized tax benefits as at September 30 45,797 29,384

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Summary of Fair Value and Carrying Value of Assets and Liabilities Measured on Recurring and Non-recurring Basis	The following table includes the estimated fair value, carrying value and categorization using the fair value hierarchy of those assets and liabilities that are measured at their estimated fair value on a recurring and non-recurring basis, as well as certain financial instruments that are not measured at fair value on a recurring basis. September 30, 2021 December 31, 2020 Fair Value Hierarchy Level Carrying Amount Asset / (Liability) $ Fair Value Asset / (Liability) $ Carrying Amount Asset / (Liability) $ Fair Value Asset / (Liability) $ Recurring: Cash, cash equivalents and restricted cash (note 16) Level 1 66,334 66,334 103,146 103,146 Derivative instruments (note 8) Interest rate swap agreement Level 2 (120) (120) (886) (886) Freight forward agreements Level 2 (270) (270) — — Non-recurring: Operating lease right-of-use assets Level 2 — — 1,799 1,799 Vessels and equipment ( note 15 ) Level 2 — — 59,250 59,250 Assets held for sale ( note 15 ) Level 2 12,740 12,740 31,680 31,680 Other: Short-term debt (note 5) Level 2 (20,000) (20,000) (10,000) (10,000) Advances to equity-accounted joint venture Note (1) 3,780 Note (1) 5,280 Note (1) Long-term debt, including current portion (note 6) Level 2 (377,529) (382,152) (242,961) (248,738) Obligations related to finance leases, including current portion (note 7) Level 2 (233,816) (247,130) (360,043) (411,740) (1) The advances to its equity-accounted joint venture, together with the Company’s investment in the equity-accounted joint venture, form the net aggregate carrying value of the Company’s interests in the equity-accounted joint venture in these unaudited consolidated financial statements. The fair values of the individual components of such aggregate interests as at September 30, 2021 and December 31, 2020 were not determinable.

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Summary of Related Party Transactions	Amounts received (paid) by the Company for related party transactions for the periods indicated were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Vessel operating expenses - technical management fee (i) (252) (248) (756) (744) Strategic and administrative service fees (ii) (8,231) (7,453) (26,471) (22,568) Secondment fees (iii) (66) (95) (221) (337) Technical management fee and service revenues (iv)(v) 175 172 519 519 (i) The cost of ship management services provided by a third party has been presented as vessel operating expenses on the Company's unaudited consolidated statements of (loss) income. The Company paid such third party technical management fees to the Manager in relation to certain former Tanker Investments Ltd. vessels. (ii) The Manager’s strategic and administrative service fees have been presented in general and administrative expenses, except for fees related to technical management services, which have been presented in vessel operating expenses on the Company’s unaudited consolidated statements of (loss) income. The Company’s executive officers are employees of Teekay or subsidiaries thereof, and their compensation (other than any awards under the Company’s long-term incentive plan) is set and paid by Teekay or such other subsidiaries. The Company compensates Teekay for time spent by its executive officers on the Company’s management matters through the strategic portion of the management fee. (iii) The Company pays secondment fees for services provided by some employees of Teekay. Secondment fees have been presented in general and administrative expenses, except for fees related to technical management services, which have been presented in vessel operating expenses on the Company's unaudited consolidated statements of (loss) income. (iv) The Company receives reimbursements from Teekay for the provision of technical management services. These reimbursements have been presented in general and administrative expenses on the Company's unaudited consolidated statements of (loss) income. (v) The Company recorded service revenues relating to Teekay Tanker Operations Limited's (or TTOL's

(Loss) Earnings Per Share (Tabl

(Loss) Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Basic and Diluted (Loss) Earnings Per Share	The net (loss) earnings available for common shareholders and (loss) earnings per common share are presented in the table below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 $ $ $ $ Net (loss) income (52,055) (44,434) (202,564) 160,603 Weighted average number of common shares - basic (1) 33,898,299 33,738,143 33,846,115 33,712,124 Dilutive effect of stock-based awards — — — 230,067 Weighted average number of common shares - diluted 33,898,299 33,738,143 33,846,115 33,942,191 (Loss) earnings per common share: – Basic (1.54) (1.32) (5.98) 4.76 – Diluted (1.54) (1.32) (5.98) 4.73

Revenue from Contract with Cust

Revenue from Contract with Customer (Details)	9 Months Ended
	Sep. 30, 2021contract
Disaggregation of Revenue [Line Items]
Number of forms of contracts	2

Revenue Revenue - Disaggregatio

Revenue Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 115,890	$ 170,240	$ 382,059	$ 758,632
Voyage Charters - Suezmax
Disaggregation of Revenue [Line Items]
Total revenues	59,651	51,134	177,388	302,839
Voyage Charters - Aframax
Disaggregation of Revenue [Line Items]
Total revenues	22,767	38,847	73,380	170,680
Voyage Charters - LR2
Disaggregation of Revenue [Line Items]
Total revenues	17,342	17,007	51,009	93,666
Voyage Charters - Full Service Lightering
Disaggregation of Revenue [Line Items]
Total revenues	7,319	18,831	31,501	84,038
Voyage charter revenues
Disaggregation of Revenue [Line Items]
Total revenues	107,079	125,819	333,278	651,223
Time Charters - Aframax
Disaggregation of Revenue [Line Items]
Total revenues	6,097	4,725	17,629	6,883
Time Charters - Suezmax
Disaggregation of Revenue [Line Items]
Total revenues	0	35,133	20,390	81,700
Time Charters - LR2
Disaggregation of Revenue [Line Items]
Total revenues	0	2,322	3,428	4,150
Time-charter [Member]
Disaggregation of Revenue [Line Items]
Total revenues	6,097	42,180	41,447	92,733
Ship-to-ship support services, Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,676	777	3,777	8,619
Commercial management, Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,038	1,464	3,557	5,665
LNG terminal management, consultancy and other, Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	392
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,714	$ 2,241	$ 7,334	$ 14,676

Revenue - Charters-out (Details

Revenue - Charters-out (Details) $ in Millions	Sep. 30, 2021USD ($)vessel	Sep. 06, 2021vessel	Dec. 31, 2020USD ($)vessel
Disaggregation of Revenue [Line Items]
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year | $	$ 4.7
Operating Leases, Future Minimum Payments Receivable, in Two Years | $	$ 5.2		$ 45.3
Operating Leases, Future Minimum Payments Receivable, in Three Years | $			$ 5.2
Charters Out | Time-charter [Member]
Disaggregation of Revenue [Line Items]
Number Of Vessels | vessel	2
Suezmax, Aframax and LR2 Vessels [Member] | Time-charter [Member]
Disaggregation of Revenue [Line Items]
Number Of Vessels | vessel			9
Aframax Tanker
Disaggregation of Revenue [Line Items]
Number Of Vessels | vessel	1	1

Revenue - Contract Liabilities

Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Time-charter [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Current	$ 1.6	$ 4.2

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) - segment	3 Months Ended	9 Months Ended	17 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021
Segment Reporting [Abstract]
Number of reportable segments	1	1	1

Segment Reporting - Schedule of

Segment Reporting - Schedule of Company's Revenue and Income From Operations by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 115,890	$ 170,240	$ 382,059	$ 758,632
Voyage expenses	(78,335)	(57,777)	(219,153)	(238,576)
Operating Costs and Expenses	(39,103)	(46,336)	(125,280)	(143,203)
Time-charter hire expenses	(2,870)	(9,070)	(8,638)	(28,245)
Depreciation and amortization	(25,837)	(29,992)	(79,416)	(89,170)
General and administrative expenses	(10,542)	(9,887)	(34,245)	(28,957)
(Loss) gain on sale of assets and (write-down) of assets	(697)	(44,973)	(88,098)	(45,164)
Restructuring Charges	0	1,398	0	1,398
Income from operations	(41,494)	(29,193)	(172,771)	183,919
Equity income	$ (873)	$ 46	$ (2,061)	5,174
Operating Segments | Tankers [Member]
Segment Reporting Information [Line Items]
Revenues				751,640
Voyage expenses				(238,576)
Operating Costs and Expenses				(137,263)
Time-charter hire expenses				(28,245)
Depreciation and amortization				(88,677)
General and administrative expenses				(28,330)
(Loss) gain on sale of assets and (write-down) of assets				(48,245)
Restructuring Charges				1,398
Income from operations				180,906
Equity income				5,174
Operating Segments | Ship To Ship Transfer [Member]
Segment Reporting Information [Line Items]
Revenues				6,992
Voyage expenses				0
Operating Costs and Expenses				(5,940)
Time-charter hire expenses				0
Depreciation and amortization				(493)
General and administrative expenses				(627)
(Loss) gain on sale of assets and (write-down) of assets				3,081
Restructuring Charges				0
Income from operations				3,013
Equity income				$ 0

Short-Term Debt (Details)

Short-Term Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2018
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 34,300	$ 32,000
Short-term debt (note 5)	$ 20,000	$ 10,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	3.60%	3.60%
Short-term Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 80,000	$ 40,000
Debt Instrument, Term	6 months
Minimum [Member]
Short-term Debt [Line Items]
Debt Covenant, Required Capital Invested	$ 20,000
Maximum [Member]
Short-term Debt [Line Items]
Debt Covenant, Required Capital Invested	$ 30,000
London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Short-term Debt, Percentage Bearing Variable Interest Rate	3.50%

Long-Term Debt - Summary of Lon

Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal	$ 382,313	$ 249,568
Less: unamortized discount and debt issuance costs	(4,784)	(6,607)
Total debt	377,529	242,961
Less: current portion	(34,399)	(10,858)
Long-term portion	343,130	232,103
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total principal	326,167	185,000
Term Loans
Debt Instrument [Line Items]
Total principal	$ 56,146	$ 64,568

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information - Revolvers and Term Loans (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)credit_facilityvessel	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 34,300,000	$ 32,000,000
Total principal	$ 382,313,000	$ 249,568,000
Debt Covenant Minimum Hull Coverage Ratio	100.00%
Minimum liquidity covenant requirement	$ 35,000,000
Minimum liquidity as a percentage of consolidated debt covenant requirement	5.00%
Weighted-average effective interest rate	2.50%	2.60%
Aggregate annual long-term principal repayments, remainder of 2021	$ 2,800,000
Aggregate annual long-term principal repayments, 2022	70,800,000
Aggregate annual long-term principal repayments, 2023	107,400,000
Aggregate annual long-term principal repayments, 2024	$ 201,300,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Number Of Debt Instruments | credit_facility	1
Line of Credit Facility, Maximum Borrowing Capacity	$ 391,200,000	$ 438,400,000
Line of Credit Facility, Remaining Borrowing Capacity	65,000,000	253,400,000
Long-term Debt, Revolving Credit Facility, Decrease in Amount Available Remaining Fiscal Year	44,200,000
Long-term Debt, Revolving Credit Facility, Decrease in Amount Available Year One	80,400,000
Long-term Debt, Revolving Credit Facility, Decrease in Amount Available Year Two	65,300,000
Long-term Debt, Revolving Credit Facility, Decrease in Amount Available Year Three	201,300,000
Total principal	$ 326,167,000	185,000,000
Term Loans
Debt Instrument [Line Items]
Number Of Debt Instruments | credit_facility	1
Total principal	$ 56,146,000	$ 64,568,000
Term Loan Due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral, Number of Vessels | vessel	4
Debt Covenant Minimum Hull Coverage Ratio	125.00%
Actual Hull Coverage Ratio	177.00%
2020DebtFacilityMaturinginDecember2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral, Number of Vessels | vessel	30
Debt Covenant Minimum Hull Coverage Ratio	125.00%
Actual Hull Coverage Ratio	212.00%
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Actual Hull Coverage Ratio	104.00%	121.00%
Long-term Debt, Term	6 months
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.40%	2.40%
London Interbank Offered Rate (LIBOR) [Member] | Term Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%	2.25%

Operating Leases and Obligati_3

Operating Leases and Obligations Related to Finance Leases - Operating Leases (Details) $ in Millions	Sep. 30, 2021USD ($)vessel	Sep. 06, 2021vessel
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year	$ 5.2
Lessee, Operating Lease, Liability, to be Paid, Year One	24.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	18.2
Lessee, Operating Lease, Liability, Payments, Due Year Three	6.8
Lessee, Operating Lease, Liability, to be Paid, Year Four	6.8
Lessee, Operating Lease, Liability, to be Paid, After Year Four	$ 24.5
Aframax Tanker
Operating Leased Assets [Line Items]
Number Of Vessels | vessel	1	1
Lessee, Operating Lease, Term of Contract	2 years
Aframax Tanker Newbuilding
Operating Leased Assets [Line Items]
Number Of Vessels | vessel	1
Lessee, Operating Lease, Term of Contract	7 years

Operating Leases and Obligati_4

Operating Leases and Obligations Related to Finance Leases - Finance Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finance Leased Assets [Line Items]
Finance Lease, Liability	$ 233,816	$ 360,043
Current obligations related to finance leases (note 7)	20,005	78,476
Long-term obligations related to finance leases (note 7)	$ 213,811	$ 281,567

Operating Leases and Obligati_5

Operating Leases and Obligations Related to Finance Leases - Finance Leases Additional Information (Details) $ in Millions	1 Months Ended	6 Months Ended	9 Months Ended
	Nov. 30, 2021	Sep. 30, 2021USD ($)vesselvaluators	Sep. 30, 2021USD ($)vessellessorvaluators	Nov. 03, 2021vessel	Sep. 06, 2021vessel	Feb. 05, 2021vessel	Dec. 31, 2020	Sep. 30, 2020vessel
Finance Leased Assets [Line Items]
Number of lessors | lessor			1
Lessee, sales-type lease, number of vessels repurchased			8
Minimum liquidity covenant requirement | $		$ 35	$ 35
Minimum liquidity as a percentage of consolidated debt covenant requirement		5.00%	5.00%
Debt Covenant Minimum Free Liquidity And Undrawn Revolving Credit Line | $		$ 35	$ 35
Finance Lease, Weighted Average Discount Rate, Percent		5.30%	5.30%				7.80%
Debt Covenant Minimum Hull Coverage Ratio			100.00%
Subsequent Event [Member]
Finance Leased Assets [Line Items]
Sale Leaseback Transaction, Lease Terms	seven
Debt Covenant Minimum Hull Coverage Ratio	105.00%
Aframax Tanker
Finance Leased Assets [Line Items]
Number Of Vessels		1	1		1
Aframax Tanker | Subsequent Event [Member]
Finance Leased Assets [Line Items]
Number Of Vessels				1
Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels								3
Aframax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels						2
Minimum [Member]
Finance Leased Assets [Line Items]
Number of Third Party Valuators | valuators		1	1
Loss Contingency, Damages Sought, Value | $		$ 7.3
Sale Leaseback Transaction, Lease Terms			eight
Actual Hull Coverage Ratio		104.00%	104.00%				121.00%
Long-term Debt, Term		6 months	6 months
Maximum
Finance Leased Assets [Line Items]
Sale Leaseback Transaction, Lease Terms			12
Actual Hull Coverage Ratio		130.00%	130.00%				156.00%
July 2017 Sale Leaseback [Member] | Suezmax Tankers
Finance Leased Assets [Line Items]
Number of Vessels with Purchase Option		4	4
November 2018 Sale leaseback Transaction [Member] | Suezmax and LR2 Tankers
Finance Leased Assets [Line Items]
Number of Vessels with Purchase Option		2	2
July 2017, November 2018 and September 2021 Sale Leaseback Transaction | Aframax Suezmax and LR2 Tankers
Finance Leased Assets [Line Items]
Number of Vessels with Purchase Option		10	10
Number Of Vessels		10	10
September 2021 sale Leaseback | Suezmax and Aframax Tankers
Finance Leased Assets [Line Items]
Number of Vessels with Purchase Option		4	4
Number Of Vessels		4	4
November 2021 Sale Leaseback | Aframax Tankers | Subsequent Event [Member]
Finance Leased Assets [Line Items]
Number Of Vessels				4
Finance Lease Obligations [Member]
Finance Leased Assets [Line Items]
Minimum liquidity covenant requirement | $		$ 35	$ 35
Minimum liquidity as a percentage of consolidated debt covenant requirement		5.00%	5.00%
Debt Covenant Minimum Free Liquidity And Undrawn Revolving Credit Line | $		$ 35	$ 35
Finance Lease Obligations [Member] | Minimum [Member]
Finance Leased Assets [Line Items]
Long-term Debt, Term		6 months	6 months
Finance Lease Obligations [Member] | July 2017 and November 2018 Sale leaseback transaction | Aframax Suezmax and LR2 Tankers
Finance Leased Assets [Line Items]
Number Of Vessels		6	6
Finance Lease Obligations [Member] | September 2021 sale Leaseback | Suezmax and Aframax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels		4	4

Operating Leases and Obligati_6

Operating Leases and Obligations Related to Finance Leases - Finance Leases Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finance Leased Assets [Line Items]
Finance Lease, Liability, Payment, Due	$ 297,400	$ 480,900
Finance Lease, Liability, Undiscounted Excess Amount	62,800	$ 120,900
Finance Lease, Liability, Payments, Due Next Twelve Months	8,172
Finance Lease, Liability, to be Paid, Year One	31,937
Finance Lease, Liability, Payments, Due Year Two	31,695
Finance Lease, Liability, Payments, Due Year Three	31,517
Finance Lease, Liability, Payments, Due Year Four	31,209
Finance Lease, Liability, Payments, Due after Year Five	$ 162,852

Derivative Instruments - Summar

Derivative Instruments - Summary of Interest Rate Swap Positions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Minimum [Member]
LIBOR-Based Debt:
Debt Instrument, Basis Spread on Variable Rate	2.25%
Maximum
LIBOR-Based Debt:
Debt Instrument, Basis Spread on Variable Rate	2.40%
London Interbank Offered Rate (LIBOR) [Member] | United States Dollar Denominated Interest Rate Swaps One [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 50,000
Fair Value /Carrying Amount of Liability	$ (120)
LIBOR-Based Debt:
Remaining Term	3 years 3 months 18 days
Fixed Swap Rate	0.76%

Derivative Instruments - Locati

Derivative Instruments - Location and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 181	$ 0
Current portion of derivative liabilities (note 8)	(571)	(289)
Derivative liabilities (note 8)	0	(597)
Reported Value Measurement [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	181	0
Current portion of derivative liabilities (note 8)	(571)	(289)
Derivative liabilities (note 8)	0	(597)
Reported Value Measurement [Member] | Interest rate swap agreement
Derivatives, Fair Value [Line Items]
Derivative Assets	181	0
Current portion of derivative liabilities (note 8)	(301)	289
Derivative liabilities (note 8)	0	$ (597)
Reported Value Measurement [Member] | Forward freight agreements
Derivatives, Fair Value [Line Items]
Derivative Assets	0
Current portion of derivative liabilities (note 8)	(270)
Derivative liabilities (note 8)	$ 0

Derivative Instruments - Gain (

Derivative Instruments - Gain (Loss) for Derivative Instruments Not Designated or Qualifying as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Realized gains (losses)	$ (438)	$ (242)	$ (635)	$ 118
Unrealized gains (losses)	211	(172)	599	(1,948)
Total	(227)	(414)	(36)	(1,830)
Interest rate swap agreement
Derivative [Line Items]
Realized gains (losses)	(79)	(58)	(216)	551
Unrealized gains (losses)	75	49	766	(1,648)
Total	(4)	(9)	550	(1,097)
Forward freight agreements
Derivative [Line Items]
Realized gains (losses)	(359)	(184)	(419)	(433)
Unrealized gains (losses)	136	(221)	(167)	(300)
Total	$ (223)	$ (405)	$ (586)	$ (733)

Other (Expense) Income - Compon

Other (Expense) Income - Components of Other (Expense) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Liabilities Disclosure [Abstract]
Foreign exchange gain (loss)	$ 143	$ (514)	$ 130	$ 534
Other (expense) income		44		1,079
Other Nonoperating Expense	(1,724)		(2,186)
Total	$ (1,581)	$ (470)	$ (2,056)	$ 1,613

Income Tax Recovery (Details)

Income Tax Recovery (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 45,797	$ 29,384	$ 49,124	$ 49,579
Increases for positions related to the current year	2,890	2,290
Increases for positions related to prior years	3,955	2,906
Decreases for positions taken in prior years	0	(15,164)
Settlements with tax authority	0	(8,556)
Decreases related to statute of limitations	(9,988)	(961)
Foreign exchange gain	$ (184)	$ (710)

Income Tax Recovery (Details)_2

Income Tax Recovery (Details) - USD ($) $ in Thousands	1 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2021	Aug. 31, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions				$ 0	$ 15,164
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority			$ 8,600
Settlement with Taxing Authority [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			$ 15,200
Payments for Other Taxes	$ 900	$ 7,700

Financial Instruments - Summary

Financial Instruments - Summary of Fair Value and Carrying Value of Assets and Liabilities Measured on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash (note 16)	$ 66,334	$ 103,146	$ 128,995	$ 96,790
Freight forward agreements	571	289
Operating Lease, Right-of-Use Asset	10,334	2,529
Vessels and equipment (note 15)	1,073,465	1,104,742
Short-term Debt	(20,000)	(10,000)
Long-term debt, including current portion (note 6)	(377,529)	(242,961)
Obligations related to finance leases, including current portion (note 7)	(233,816)	(360,043)
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Freight forward agreements	571	289
Advances to equity-accounted joint venture	3,780	5,280
Reported Value Measurement [Member] | Interest rate swap agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Freight forward agreements	301	(289)
Reported Value Measurement [Member] | Forward freight agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Freight forward agreements	270
Level 2 | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term Debt	(20,000)	(10,000)
Long-term debt, including current portion (note 6)	(377,529)	(242,961)
Obligations related to finance leases, including current portion (note 7)	(233,816)	(360,043)
Level 2 | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term Debt	(20,000)	(10,000)
Long-term debt, including current portion (note 6)	(382,152)	(248,738)
Obligations related to finance leases, including current portion (note 7)	(247,130)	(411,740)
Fair Value, Recurring [Member] | Level 1 | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash (note 16)	66,334	103,146
Fair Value, Recurring [Member] | Level 1 | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash (note 16)	66,334	103,146
Fair Value, Recurring [Member] | Level 2 | Reported Value Measurement [Member] | Interest rate swap agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreement	(120)	(886)
Fair Value, Recurring [Member] | Level 2 | Reported Value Measurement [Member] | Forward freight agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Freight forward agreements	270	0
Fair Value, Recurring [Member] | Level 2 | Estimate of Fair Value Measurement [Member] | Interest rate swap agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreement	(120)	(886)
Fair Value, Recurring [Member] | Level 2 | Estimate of Fair Value Measurement [Member] | Forward freight agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Freight forward agreements	270	0
Fair Value, Nonrecurring [Member] | Level 2 | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Operating Lease, Right-of-Use Asset	0	1,799
Vessels and equipment (note 15)	0	59,250
Assets held for sale(note 15)	12,740	31,680
Fair Value, Nonrecurring [Member] | Level 2 | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Operating Lease, Right-of-Use Asset	0	1,799
Vessels and equipment (note 15)	0	59,250
Assets held for sale(note 15)	$ 12,740	$ 31,680

Capital Stock and Equity-Base_2

Capital Stock and Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	100,000,000		100,000,000		100,000,000
Preferred stock, par value (usd per share)	$ 0.01		$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	585,000,000		585,000,000		585,000,000
Preferred stock, shares issued (in shares)	0		0		0
Preferred Stock, Shares Outstanding	0		0		0
Restricted Stock [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			56,000	78,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 0.8	$ 1.3
General and Administrative Expense [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Employee Benefits and Share-based Compensation	$ 0.5	$ 0.4	$ 1.4	$ 1.3
Common Class A [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	485,000,000		485,000,000		485,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Common Stock, Voting Rights, Votes Per Share Owned			$ 1
Common stock, shares issued (in shares)	29,200,000		29,200,000		29,100,000
Common Stock, Shares, Outstanding	29,200,000		29,200,000		29,100,000
Common Class A [Member] | Restricted Stock Units
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			35,700	44,800
Common Class B [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000		100,000,000		100,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Common Stock, Voting Rights, Votes Per Share Owned			$ 5
Maximum percentage of voting power			49.00%
Common stock, shares issued (in shares)	4,600,000		4,600,000		4,600,000
Common Stock, Shares, Outstanding	4,600,000		4,600,000		4,600,000

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Operating Costs and Expenses	$ (39,103)	$ (46,336)	$ (125,280)	$ (143,203)
Strategic and administrative service fees	(8,231)	(7,453)	(26,471)	(22,568)
Vessel operating expenses - technical management fee
Related Party Transaction [Line Items]
Operating Costs and Expenses	(252)	(248)	(756)	(744)
Secondment fees
Related Party Transaction [Line Items]
Strategic and administrative service fees	(66)	(95)	(221)	(337)
Technical management fee revenues
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 175	$ 172	$ 519	$ 519

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Due to Affiliate, Current	$ 9,831	$ 3,123
Payable to Manager [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	$ 2,200	$ 9,000

(Loss) Earnings Per Share - Bas

(Loss) Earnings Per Share - Basic and Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (Loss) Income	$ (52,055)	$ (129,144)	$ (21,365)	$ (44,434)	$ 98,198	$ 106,839	$ (202,564)	$ 160,603
Weighted average number of common shares – basic (in shares)	33,898,299			33,738,143			33,846,115	33,712,124
Dilutive effect of stock-based awards (in shares)	0			0			0	230,067
Weighted average number of common shares – diluted (in shares)	33,898,299			33,738,143			33,846,115	33,942,191
(Loss) earnings per common share:
– Basic (usd per share)	$ (1.54)			$ (1.32)			$ (5.98)	$ 4.76
– Diluted (usd per share)	$ (1.54)			$ (1.32)			$ (5.98)	$ 4.73

(Loss) Earnings Per Share - Add

(Loss) Earnings Per Share - Additional Information (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	300	200	300	100
Share-based Payment Arrangement [Member] | Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	600	200	600	200

(Write-down) and Gain (loss) _2

(Write-down) and Gain (loss) on Sale of Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)vessel	Sep. 30, 2020USD ($)vessel	Sep. 30, 2021USD ($)vessel	Sep. 30, 2020USD ($)vessel	Nov. 03, 2021vessel	Sep. 06, 2021vessel	Feb. 05, 2021vessel
Property, Plant and Equipment [Line Items]
Asset Impairment Charges		$ 43,500	$ 85,000	$ 43,500
Operating Lease, Impairment Loss		$ 1,400	700	2,100
Proceeds from Sale of Property, Plant, and Equipment			44,675	85,892
Aframax Tanker
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 900		$ 900
Ship To Ship Transfer Business [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on sale of ship-to-ship transfer business				3,100
Ship To Ship Transfer Business [Member] | Ship To Ship Transfer Business [Member]
Property, Plant and Equipment [Line Items]
Sale of ship-to-ship transfer business				27,100
Adjustment for final amounts of cash and other working capital on closing date				$ 1,100
Suezmax Tankers [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels impaired | vessel			3
Aframax Tanker
Property, Plant and Equipment [Line Items]
Number Of Vessels impaired | vessel			1
LR2 tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels impaired | vessel			3
Aframax Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels impaired | vessel		5		5
Suezmax Tankers [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels | vessel		3		3
Gain (Loss) on Disposition of Assets				$ 2,600
Aframax Tanker
Property, Plant and Equipment [Line Items]
Number Of Vessels | vessel	1		1			1
Asset Impairment Charges			$ 1,700
Gain (Loss) on Disposition of Assets	$ 200		200
Proceeds from Sale of Property, Plant, and Equipment	$ 11,700		11,700
Aframax Tanker | Subsequent Event [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels | vessel					1
Aframax Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels | vessel							2
Proceeds from Sale of Property, Plant, and Equipment			$ 32,000

Restructuring and Related Act_2

Restructuring and Related Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Restructuring Charges	$ 0	$ 1,398	$ 0	$ 1,398
Restructuring Reserve	$ 0		$ 0		$ 1,000

Liquidity (Details)

Liquidity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)vessel	Sep. 30, 2020USD ($)	Nov. 03, 2021vessel	Feb. 05, 2021vessel
Other Commitments [Line Items]
Payments to Acquire Property, Plant, and Equipment | $	$ 15,168	$ 8,881
Suezmax and Aframax Tankers | September 2021 sale Leaseback
Other Commitments [Line Items]
Number Of Vessels	4
Aframax Tankers
Other Commitments [Line Items]
Number Of Vessels				2
Aframax Tankers | Subsequent Event [Member] | November 2021 Sale Leaseback
Other Commitments [Line Items]
Number Of Vessels			4

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Nov. 30, 2021USD ($)	Sep. 30, 2021USD ($)vessel	Sep. 30, 2021USD ($)vessel	Sep. 30, 2020USD ($)	Nov. 03, 2021vessel	Sep. 06, 2021vessel	Feb. 05, 2021vessel
Subsequent Event [Line Items]
Proceeds from financing related to sales and leaseback of vessels (note 7) | $			$ 72,065	$ 0
Proceeds from Sale of Property, Plant, and Equipment | $			$ 44,675	$ 85,892
Debt Covenant Minimum Hull Coverage Ratio			100.00%
Suezmax and Aframax Tankers | September 2021 sale Leaseback
Subsequent Event [Line Items]
Number Of Vessels | vessel		4	4
Aframax Tanker
Subsequent Event [Line Items]
Number Of Vessels | vessel		1	1			1
Proceeds from Sale of Property, Plant, and Equipment | $		$ 11,700	$ 11,700
Aframax Tankers
Subsequent Event [Line Items]
Number Of Vessels | vessel							2
Proceeds from Sale of Property, Plant, and Equipment | $			$ 32,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from financing related to sales and leaseback of vessels (note 7) | $	$ 68,900
Sale Leaseback Transaction, Lease Terms	seven
Debt Covenant Minimum Hull Coverage Ratio	105.00%
Subsequent Event [Member] | Aframax Tanker
Subsequent Event [Line Items]
Number Of Vessels | vessel					1
Subsequent Event [Member] | Aframax Tankers | November 2021 Sale Leaseback
Subsequent Event [Line Items]
Number Of Vessels | vessel					4