Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 12, 2017	Sep. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance			1,907,769
Share-based long term incentive plan unit expense			$ 385	$ 400	$ 393
Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period			24,421	22,076	22,571
Director [Member] \| Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period		10,002
Dedicated or partially dedicated personnel [Member] \| Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	14,419
Vest December 12, 2018 [Member] \| Dedicated or partially dedicated personnel [Member] \| Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	8,533
Vest December 12, 2019 [Member] \| Dedicated or partially dedicated personnel [Member] \| Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	5,886