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

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

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Debt Covenant Minimum Hull Coverage Ratio, Year 2

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Maintain 100% Hull Overage Ratio

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Maintain 80% Hull Coverage Ratio for the Third & Fourth Year

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Number Of Vessels

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The number of vessels sold during the period.

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

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Weighted average discount rate for finance lease calculated at point in time.

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Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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Leases Finance Lease Obligation (Details) $ in Thousands	1 Months Ended				6 Months Ended		12 Months Ended
Leases Finance Lease Obligation (Details) $ in Thousands	May 31, 2019 USD ($) vessel	Nov. 30, 2018 USD ($) vessel	Sep. 30, 2018 vessel	Jul. 31, 2017 USD ($) vessel	Jun. 30, 2019 USD ($) vessel	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) vessel
Finance Leased Assets [Line Items]
Number of Lessors					16
Proceeds from financing related to sales and leaseback of vessels (note 8) \| $					$ 63,720	$ 0
Number Of Vessels					2		8
Finance Lease, Weighted Average Discount Rate, Percent					7.70%		7.50%
Total obligations related to finance leases \| $					$ 426,936		$ 375,289
Current obligations related to finance leases (note 8) \| $					24,397		20,896
Finance Lease, Liability, Noncurrent \| $					$ 402,539		$ 354,393
Aframax Tanker
Finance Leased Assets [Line Items]
Debt Covenant Minimum Hull Coverage Ratio					90.00%
Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels		1
May 2019 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Actual Hull Coverage Ratio							0.00%
July 2017 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Actual Hull Coverage Ratio							101.00%
Finance Lease Obligations [Member] \| Aframax Tanker
Finance Leased Assets [Line Items]
Number Of Vessels		2	6
Actual Hull Coverage Ratio					102.00%		91.00%
Debt Covenant Minimum Hull Coverage Ratio					75.00%
Debt Covenant Minimum Hull Coverage Ratio, Year 2					78.00%
Maintain 80% Hull Coverage Ratio for the Third & Fourth Year					80.00%
Finance Lease Obligations [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Debt Covenant Minimum Hull Coverage Ratio					100.00%
Finance Lease Obligations [Member] \| Suezmax, Aframax and LR2 Sale Leaseback [Member]
Finance Leased Assets [Line Items]
Maintain 100% Hull Overage Ratio					100.00%
Actual Hull Coverage Ratio					133.00%		122.00%
Finance Lease Obligations [Member] \| May 2019 Sale Leaseback [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels (note 8) \| $	$ 63,700
Number Of Vessels	2				2
Finance Lease Obligations [Member] \| May 2019 Sale Leaseback [Member] \| Aframax Tanker
Finance Leased Assets [Line Items]
Debt Covenant Minimum Hull Coverage Ratio					78.00%
Finance Lease Obligations [Member] \| May 2019 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Debt Covenant Minimum Hull Coverage Ratio, Thereafter					90.00%
Actual Hull Coverage Ratio					97.00%
Debt Covenant Minimum Hull Coverage Ratio					75.00%
Maintain 80% Hull Coverage Ratio for the Third & Fourth Year					80.00%
Finance Lease Obligations [Member] \| Suezmax Tanker Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels Sold	2
Finance Lease Obligations [Member] \| November 2018 Sale-leaseback Transaction [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels (note 8) \| $		$ 84,700
Number Of Vessels		4			4
Finance Lease Obligations [Member] \| July 2017 Sale Leaseback [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels (note 8) \| $				$ 153,000
Number Of Vessels					4
Finance Lease Obligations [Member] \| July 2017 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels Sold				4
Actual Hull Coverage Ratio					112.00%
Debt Covenant Minimum Hull Coverage Ratio					90.00%
Option to Purchase July 2020- Nov 2021[Member] \| Suezmax, Aframax and LR2 Vessels [Member]
Finance Leased Assets [Line Items]
Number Of Vessels					16
Option to Purchase July 2020- Nov 2021[Member] \| Suezmax, Aframax and LR2 Sale Leaseback [Member] \| Suezmax, Aframax and LR2 Vessels [Member]
Finance Leased Assets [Line Items]
Number Of Vessels		4
Variable Interest Entity, Primary Beneficiary [Member]
Finance Leased Assets [Line Items]
Number of Lessors					14