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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Accrued Liabilities (Receivables), Current

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- Definition

Derivative instruments not designated as hedging instruments realized gain (loss) net.

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- Definition

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

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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.

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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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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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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.

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Fair value, after the effects of master netting arrangements, of a financial liability or 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.

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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.

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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.

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Derivative Instruments - Summary of Interest Rate Swap Positions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Realized gains (losses)	$ 800,000	$ 656,000	$ 1,741,000	$ 846,000
Current portion of derivative assets (note 9)	1,229,000		1,229,000		$ 2,905,000
LIBOR-Based Debt:
Derivative Asset, Noncurrent	240,000		240,000		2,973,000
Accrued Liabilities (Receivables), Current	(487,000)		(487,000)		(419,000)
Derivative Liability, Current	0		$ 0		(57,000)
Minimum [Member]
LIBOR-Based Debt:
Debt Instrument, Basis Spread on Variable Rate			0.30%
Maximum
LIBOR-Based Debt:
Debt Instrument, Basis Spread on Variable Rate			3.50%
Interest rate swap agreements
Derivative [Line Items]
Realized gains (losses)	829,000	674,000	$ 1,783,000	864,000
Current portion of derivative assets (note 9)	1,168,000		1,168,000		2,905,000
LIBOR-Based Debt:
Derivative Asset, Noncurrent	240,000		240,000		2,973,000
Accrued Liabilities (Receivables), Current	(487,000)		(487,000)		(422,000)
Derivative Liability, Current	0		0		0
U.S. Dollar-denominated interest rate swap 1
LIBOR-Based Debt:
Notional Amount	69,422,000		69,422,000
Fair Value / Carrying Amount of Asset	$ 292,000		$ 292,000
Remaining Term			1 year 6 months
Fixed Interest Rate	1.46%		1.46%
United States Dollar Denominated Interest Rate Swaps Two [Member]
LIBOR-Based Debt:
Notional Amount	$ 150,000,000		$ 150,000,000
Fair Value / Carrying Amount of Asset	$ 610,000		$ 610,000
Remaining Term			1 year 6 months
Fixed Interest Rate	1.55%		1.55%
United States Dollar Denominated Interest Rate Swaps Three [Member]
LIBOR-Based Debt:
Notional Amount	$ 50,000,000		$ 50,000,000
Fair Value / Carrying Amount of Asset	$ 506,000		$ 506,000
Remaining Term			1 year 6 months
Fixed Interest Rate	1.16%		1.16%
Freight Forward Agreements [Member]
Derivative [Line Items]
Realized gains (losses)	$ (29,000)	$ (18,000)	$ (42,000)	$ (18,000)
Current portion of derivative assets (note 9)	61,000		61,000
LIBOR-Based Debt:
Derivative Asset, Noncurrent	0		0		0
Accrued Liabilities (Receivables), Current	0		0		(3,000)
Derivative Liability, Current	$ 0		$ 0		$ 57,000