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Interest bearing debt, Nordea Credit Facility (Details) $ in Thousands		1 Months Ended					3 Months Ended	9 Months Ended
		Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2017 USD ($) Carrier	Jun. 30, 2018 USD ($) Building	Sep. 30, 2020 USD ($)	Sep. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)
Credit Facility [Abstract]
Borrowing amount								$ 492,368
Nordea Credit Facility [Member]
Credit Facility [Abstract]
Borrowing amount						$ 204,000	$ 96,000			$ 300,000
Number of VLCCs Delivered | Carrier						9
Number of newbuilding contracts | Building							2
Adjustment to interest rate basis	[1]							2.40%
Debt prepayment before installment term		$ 37,000	$ 25,800	$ 22,300	$ 35,000
Frequency of periodic repayment								Quarterly
Debt repayment installment amount								$ 4,200
Credit facility covenant, required adjusted tangible net worth								$ 300,000
Nordea Credit Facility [Member] | Scrubbers [Member]
Credit Facility [Abstract]
Frequency of periodic repayment								Quarterly
Debt repayment installment amount								$ 2,250
Secured commitment related to financing				$ 45,000					$ 50,000
Nordea Credit Facility [Member] | Bottom of Range [Member]
Credit Facility [Abstract]
Credit facility covenant, required percentage of charter-free market value of vessels to borrowings								135.00%
Credit facility covenant, required percentage of adjusted tangible net worth to total assets								25.00%
Credit facility covenant, required unencumbered consolidated cash								$ 30,000
Credit facility covenant, required percentage of unencumbered consolidated cash to gross interest bearing debt								6.00%
Nordea Credit Facility [Member] | Second Quarter of 2023 [Member]
Credit Facility [Abstract]
Debt repayment final amount								$ 82,300
Nordea Credit Facility [Member] | Second Quarter of 2023 [Member] | Scrubbers [Member]
Credit Facility [Abstract]
Debt repayment final amount								$ 18,000
Nordea Credit Facility [Member] | LIBOR [Member]
Credit Facility [Abstract]
Adjustment to interest rate basis								2.40%
Nordea Credit Facility [Member] | LIBOR [Member] | Scrubbers [Member]
Credit Facility [Abstract]
Adjustment to interest rate basis									2.40%
[1] $70.3 mill. undrawn as of September 30, 2020.

X

- Definition

The amount of adjusted tangible net worth required to be maintained to fulfill Credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The percentage of adjusted tangible net worth to adjusted total assets value required to be maintained to fulfill Credit facility covenant.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of unencumbered consolidated cash to gross interest bearing debt required to be maintained to fulfill credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The amount of unencumbered consolidated cash required to be maintained to fulfill Credit facility covenant.

+ References

No definition available.

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X

- Definition

Refers to the required percentage of the charter-free market value of the vessels to the borrowings under the covenants of the credit facility.

+ References

No definition available.

+ Details

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- Definition

Amount of the required periodic installment payments including both interest and principal payments.

+ References

No definition available.

+ Details

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- Definition

The amount of prepayment of debt for final settlement.

+ References

No definition available.

+ Details

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- Definition

The description of the frequency of periodic repayment of credit facility.

+ References

No definition available.

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- Definition

Number of newbuilding contracts during the period..

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- Definition

Number of VLCCs delivered during the period.

+ References

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- Definition

The amount of Commitment funding that the entity is obligated to repay towards financing activities.

+ References

No definition available.

+ Details

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- Definition

The amount of voluntary prepayment of debt before installment term.

+ References

No definition available.

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2020-01-01
-Paragraph 55
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- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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