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

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

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

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

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- Definition

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

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

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

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- Definition

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

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Leases - Additional Information (Details)	1 Months Ended					6 Months Ended		12 Months Ended
Leases - Additional Information (Details)	May 31, 2019 USD ($) vessel	Feb. 28, 2019	Nov. 30, 2018 USD ($) vessel	Sep. 30, 2018 USD ($) vessel	Jul. 31, 2017 USD ($) vessel	Jun. 30, 2019 USD ($) vessel	Jun. 30, 2018 USD ($)	Dec. 31, 2018 vessel
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels \| $						$ 63,720,000	$ 0
Number Of Vessels						2		8
Number of Lessors						16
Debt Instrument, Term		6 months				6 months
Finance Lease, Weighted Average Discount Rate, Percent						7.70%		7.50%
LR2 Tankers [Member]
Finance Leased Assets [Line Items]
Number Of Vessels						2
Aframax Tanker
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						90.00%
Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels			1
Option to Purchase July 2020- Nov 2021[Member] \| Suezmax, Aframax and LR2 Vessels [Member]
Finance Leased Assets [Line Items]
Number Of Vessels						16
Finance Lease Obligations [Member] \| LR2 Tankers [Member]
Finance Leased Assets [Line Items]
Number Of Vessels			1
Finance Lease Obligations [Member] \| Suezmax, Aframax and LR2 Vessels [Member]
Finance Leased Assets [Line Items]
Minimum liquidity covenant requirement \| $						$ 35,000,000.0
Minimum liquidity as a percentage of consolidated debt covenant requirement						5.00%
Commitments under the capital leases \| $						$ 632,000,000
Finance Lease, Liability, Undiscounted Excess Amount \| $						$ 203,200,000
Finance Lease Obligations [Member] \| Aframax Tanker
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						75.00%
Number Of Vessels			2	6
Number Of Vessels Obligated to Purchase \| $						6
Actual Hull Coverage Ratio						102.00%		91.00%
Finance Lease Obligations [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						100.00%
Number Of Vessels Obligated to Purchase \| $						2
Finance Lease Obligations [Member] \| Minimum [Member]
Finance Leased Assets [Line Items]
Sale Leaseback Transaction, Lease Terms						P9Y
Finance Lease Obligations [Member] \| Minimum [Member] \| Suezmax, Aframax and LR2 Vessels [Member]
Finance Leased Assets [Line Items]
Debt Instrument, Term						6 months
Finance Lease Obligations [Member] \| Maximum
Finance Leased Assets [Line Items]
Sale Leaseback Transaction, Lease Terms						P12Y
Suezmax Tanker Sale Leaseback [Member] \| Finance Lease Obligations [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Number Of Vessels Sold	2
July 2017 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Actual Hull Coverage Ratio								101.00%
July 2017 Sale Leaseback [Member] \| Finance Lease Obligations [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels \| $					$ 153,000,000
Number Of Vessels						4
July 2017 Sale Leaseback [Member] \| Finance Lease Obligations [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						90.00%
Number Of Vessels Sold					4
Actual Hull Coverage Ratio						112.00%
September 2018 Sale Leaseback [Member] \| Finance Lease Obligations [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels \| $				$ 156,600,000
Number Of Vessels				6		6
November 2018 Sale-leaseback Transaction [Member] \| Finance Lease Obligations [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels \| $			$ 84,700,000
Number Of Vessels			4			4
May 2019 Sale Leaseback [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Actual Hull Coverage Ratio								0.00%
May 2019 Sale Leaseback [Member] \| Finance Lease Obligations [Member]
Finance Leased Assets [Line Items]
Proceeds from financing related to sales and leaseback of vessels \| $	$ 63,700,000
Number Of Vessels	2					2
May 2019 Sale Leaseback [Member] \| Finance Lease Obligations [Member] \| Aframax Tanker
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						78.00%
May 2019 Sale Leaseback [Member] \| Finance Lease Obligations [Member] \| Suezmax Tankers
Finance Leased Assets [Line Items]
Maintain 78% Hull Coverage Ratio for the Second Year						75.00%
Debt Covenant Minimum Hull Coverage Ratio, Thereafter						90.00%
Actual Hull Coverage Ratio						97.00%
Variable Interest Entity, Primary Beneficiary [Member]
Finance Leased Assets [Line Items]
Number of Lessors						14