Derivative Instruments - Location and Fair Value Amounts of Derivative Instruments (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Current portion of derivative assets	$ 1,229,000	$ 2,905,000
Accounts receivable (Accrued liabilities)	$ (487,000)	(419,000)
United States Dollar Denominated Interest Rate Swaps One [Member]
Derivatives, Fair Value [Line Items]
Fixed Interest Rate	1.46%
Derivative, Notional Amount	$ 69,422,000
Fair Value / Carrying Amount of Asset	$ 292,000
Remaining Term	1 year 6 months
Interest rate swap agreements
Derivatives, Fair Value [Line Items]
Current portion of derivative assets	$ 1,168,000	2,905,000
Accounts receivable (Accrued liabilities)	(487,000)	(422,000)
Forward freight agreements
Derivatives, Fair Value [Line Items]
Current portion of derivative assets	61,000
Accounts receivable (Accrued liabilities)	$ 0	$ (3,000)
United States Dollar Denominated Interest Rate Swaps Two [Member]
Derivatives, Fair Value [Line Items]
Fixed Interest Rate	1.55%
Derivative, Notional Amount	$ 150,000,000
Fair Value / Carrying Amount of Asset	$ 610,000
Remaining Term	1 year 6 months
United States Dollar Denominated Interest Rate Swaps Three [Member]
Derivatives, Fair Value [Line Items]
Fixed Interest Rate	1.16%
Derivative, Notional Amount	$ 50,000,000
Fair Value / Carrying Amount of Asset	$ 506,000
Remaining Term	1 year 6 months
Maximum [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Accrued Liabilities (Receivables), Current

+ References

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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

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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