The date that the credit facility was arranged by the CMTC.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Number of periodic payments of a credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Balance Type:	credit
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date the first payment under the line of credit must be paid, in CCYY-MM-DD format.

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Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually).

+ References

+ Details

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Period Type:	duration

- Definition

Amount of the required periodic payment applied to principal.

+ References

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Balance Type:	debit
Period Type:	duration

- Definition

Weighted average interest rate of long-term debt outstanding calculated over time.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Balance Type:	credit
Period Type:	duration

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Long-Term Debt - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	May 04, 2018 USD ($)	Jan. 17, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt outstanding balance	$ 478,909				$ 475,750
Interest expense	$ 12,518	$ 12,481
Weighted average interest rate	5.16%	4.14%
Prepayment of credit facility	$ 40,799	$ 8,677
2017 Credit Facility
Debt Instrument [Line Items]
Repayment amount	26,416
In connection with the sale of M/T Aristotelis \| 2017 Credit Facility
Debt Instrument [Line Items]
Prepayment of credit facility	$ 14,383
M/T Anikitos \| ING Bank N.V.
Debt Instrument [Line Items]
Long-term debt outstanding balance			$ 15,625
Line of credit facility, arrangement date	Nov. 19, 2015
Repayment installments	13
Frequency of Payments	quarterly
Repayment amount	$ 355
Balloon payment, payable together with the final instalment	$ 11,010
Starting period of payment installments	May 31, 2020
Debt variable rate basis	LIBOR
Credit facility margin	2.50%
Maturity date	Jun. 30, 2023
M/T Aristaios \| Credit Agricole Corporate & Investment Bank and ING Bank NV
Debt Instrument [Line Items]
Long-term debt outstanding balance				$ 28,333
Line of credit facility, arrangement date	Jan. 02, 2017
Repayment installments	12
Frequency of Payments	semi-annual
Repayment amount	$ 917
Balloon payment, payable together with the final instalment	$ 17,333
Starting period of payment installments	Jul. 31, 2018
Debt variable rate basis	LIBOR
Credit facility margin	2.85%
Maturity date	Jan. 31, 2024