Number of vessels.

No definition available.

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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.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of assets pledged to secure a debt instrument.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 942
-SubTopic 470
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-Paragraph 3
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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.

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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Debt Debt-Secured Credit Facilities Summary (Details) $ in Thousands			6 Months Ended
	Nov. 08, 2018	Oct. 03, 2018	Jun. 30, 2020 USD ($) numberOfVesselsCoveredByCreditFacility	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Number of vessels			60
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 661,253	$ 738,699
Ultramax
Debt Instrument [Line Items]
Number of vessels \| numberOfVesselsCoveredByCreditFacility			33
$12.5 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 0	8,617
$27.3 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			0	8,813
$38.7 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			0	10,200
$12.8 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 0	11,475
$30.0 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.20%
Line of Credit Facility, Commitment Fee Percentage			0.88%
Debt Instrument, Maturity Date, Description			September 18, 2023
Long-term Debt, Gross			$ 28,007	27,198
Debt Instrument, Collateral Amount			61,372
Debt Instrument, Unused Borrowing Capacity, Amount			$ 0
$30.0 Million Credit Facility [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			2
$30.0 Million Credit Facility [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			0
$60.0 Million Credit Facility [Member] [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
Line of Credit Facility, Commitment Fee Percentage			0.90%
Debt Instrument, Maturity Date, Description			September 14, 2023
Long-term Debt, Gross				26,573
Debt Instrument, Collateral Amount			$ 53,116
Debt Instrument, Unused Borrowing Capacity, Amount			$ 2,862
$60.0 Million Credit Facility [Member] [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			0
$60.0 Million Credit Facility [Member] [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			2
$184.0 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.40%
Line of Credit Facility, Commitment Fee Percentage			0.96%
Debt Instrument, Maturity Date, Description			September 21, 2023
Long-term Debt, Gross			$ 71,591	130,145
Debt Instrument, Collateral Amount			311,888
Debt Instrument, Unused Borrowing Capacity, Amount			$ 89,786
$184.0 Million Credit Facility [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			5
$184.0 Million Credit Facility [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			6
$34.0 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.35%
Line of Credit Facility, Commitment Fee Percentage		1.175%
Debt Instrument, Maturity Date, Description		October 3, 2025
Long-term Debt, Gross			$ 15,857	31,571
Debt Instrument, Collateral Amount			55,302
Debt Instrument, Unused Borrowing Capacity, Amount			$ 17,000
$34.0 Million Credit Facility [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			2
$34.0 Million Credit Facility [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			0
$90.0 Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.35%
Line of Credit Facility, Commitment Fee Percentage	1.00%
Debt Instrument, Maturity Date, Description	November 8, 2023
Long-term Debt, Gross			$ 78,150	82,100
Debt Instrument, Collateral Amount			134,618
Debt Instrument, Unused Borrowing Capacity, Amount			$ 2,850
$90.0 Credit Facility [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			0
$90.0 Credit Facility [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			6
$85.5 Million Credit Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.85%
Line of Credit Facility, Commitment Fee Percentage			1.14%
Debt Instrument, Maturity Date, Description			February 15, 2023
Long-term Debt, Gross			$ 35,971	$ 46,499
Debt Instrument, Collateral Amount			70,347
Debt Instrument, Unused Borrowing Capacity, Amount			$ 0
$85.5 Million Credit Facility [Member] \| Kamsarmax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			0
$85.5 Million Credit Facility [Member] \| Ultramax \| Secured Debt [Member]
Debt Instrument [Line Items]
Number of vessels			3