Classes of LTIP Units

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- Definition

Long term incentive partnership units outstanding.

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- Definition

Long Term Incentive Partnership Units Value Per Unit

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No definition available.

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- Definition

Long term incentive partnership units vested.

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value

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No definition available.

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- Definition

ShareBasedCompensationArrangementByShareBasedPaymentAward,Estimated Shares Expected to Vest

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No definition available.

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- Definition

Share based compensation plan.

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Not Subject to Maximum

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No definition available.

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- Definition

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.

+ References

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)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

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- Definition

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

+ References

No definition available.

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Share-Based Compensation Plan (Details Textual) $ / shares in Units, $ in Thousands												3 Months Ended
	Feb. 14, 2018 shares	Jan. 02, 2018 shares	Feb. 15, 2017 shares	Jan. 03, 2017 shares	Feb. 10, 2016 shares	Jan. 06, 2016 shares	Jul. 27, 2015 shares	Feb. 11, 2015 shares	Feb. 04, 2014 shares	Dec. 13, 2013 USD ($) $ / shares shares	Jan. 30, 2013 shares	Mar. 31, 2018 USD ($) class shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 shares
Share-Based Compensation Plan (Textual) [Abstract]
Share-based award vesting period												6 years
Number of common shares available for issuance under the 2009 Equity Incentive Plan												1,207,886
Operating Partnership outstanding (shares)												236,351		236,351
LTIP units, vested (shares)												145,598
Restricted Stock [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ 400	$ 400
Total unrecognized compensation cost \| $												$ 3,700
Weighted average remaining vesting period (in years)												2 years 1 month
Share-based equity award grant (shares)												52,609
Number of common shares issued												61,982
Restricted Stock [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based award vesting period												3 years
Restricted Stock [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based award vesting period												5 years
Performance Shares [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ (1,000)	400
Total unrecognized compensation cost \| $												$ 7,900
Weighted average remaining vesting period (in years)												2 years
Performance Shares [Member] \| January 2013 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)											72,118
Performance Shares [Member] \| January 2013 [Member] \| Officer Awards [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued						120,730
Performance Shares [Member] \| January 2013 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued						56,562
Performance Shares [Member] \| December 2013 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)										252,088
Performance Shares [Member] \| December 2013 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest										0.00%
Performance Shares [Member] \| December 2013 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest										200.00%
Performance Shares [Member] \| December 2013 - Tranche 1 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)						50,418
Number of common shares issued						25,134
Estimated shares expected to vest						49.00%
Performance Shares [Member] \| December 2013 - Tranche 2 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)				49,914
Number of common shares issued				12,285
Estimated shares expected to vest				25.00%
Performance Shares [Member] \| December 2013 - Tranche 3 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)		49,914
Number of common shares issued		72,236
Estimated shares expected to vest		145.00%
Performance Shares [Member] \| February 2014 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)									66,483
Performance Shares [Member] \| February 2014 [Member] \| Officer Awards [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued				112,782
Performance Shares [Member] \| February 2014 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued				25,619
Performance Shares [Member] \| February 2015 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)								44,962
Performance Shares [Member] \| February 2015 [Member] \| Officer Awards [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued		14,089
Performance Shares [Member] \| February 2015 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued		2,501
Performance Shares [Member] \| July 2015 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)							771
Performance Shares [Member] \| July 2015 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares issued		1,079
Performance Shares [Member] \| February 2016 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)					100,919
Shares expected to vest, not subject to maximum					17,372
Performance Shares [Member] \| February 2016 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest					0.00%
Performance Shares [Member] \| February 2016 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest					200.00%
Performance Shares [Member] \| February 2017 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)			81,939
Performance Shares [Member] \| February 2017 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest			0.00%
Performance Shares [Member] \| February 2017 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest			200.00%
Performance Shares [Member] \| February 2018 [Member] [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant (shares)	78,918
Performance Shares [Member] \| February 2018 [Member] [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest	0.00%
Performance Shares [Member] \| February 2018 [Member] [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest	200.00%
Long Term Incentive Partnership Units Class B [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based award vesting period												5 years
LTIP units granted (shares)										226,882
Value of LTIP grants per share (usd per share) \| $ / shares										$ 29.19
Grant date fair value of LTIP unit awards \| $										$ 6,623
Long Term Incentive Partnership Units [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ 300	$ 300
Total unrecognized compensation cost \| $												$ 1,900
Weighted average remaining vesting period (in years)												11 months
Classes of LTIP Units \| class												2