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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- Definition

Share based compensation plan.

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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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- 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.

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-Name Accounting Standards Codification
-Topic 718
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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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.

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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.

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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).

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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- Definition

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

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No definition available.

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Share-Based Compensation Plan - Narrative (Details) $ / shares in Units, $ in Millions									1 Months Ended			12 Months Ended
	Feb. 14, 2018 shares	Feb. 15, 2017 shares	Feb. 10, 2016 shares	Jul. 27, 2015 shares	Feb. 11, 2015 shares	Feb. 04, 2014 shares	Dec. 13, 2013 USD ($) $ / shares shares	Jan. 30, 2013 shares	Jan. 31, 2018 shares	Jan. 31, 2017 shares	Jan. 31, 2016 shares	Dec. 31, 2018 USD ($) class shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period												6 years
Common shares available for issuance under the Plan (in shares)												1,207,886
LTIP units, outstanding (in shares)												236,351	236,351
LTIP units, vested (shares)												145,598
Restricted common shares
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ 2.0	$ 1.9	$ 1.8
Total unrecognized compensation cost \| $												$ 2.2
Weighted average remaining vesting period												1 year 7 months
Awards granted (in shares)												52,609	59,139	68,535
Awards vested (in shares)												61,982	57,559	52,452
Restricted common shares \| Minimum
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period												3 years
Restricted common shares \| Maximum
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period												5 years
Performance-based shares
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ 3.2	$ 2.6	$ 5.6
Total unrecognized compensation cost \| $												$ 4.6
Weighted average remaining vesting period												1 year 6 months
Performance-based shares \| January 30, 2013
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)								72,118
Performance-based shares \| January 30, 2013 \| Officer awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)											120,730
Performance-based shares \| January 30, 2013 \| Non-executive management awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)											56,562
Performance-based shares \| December 13, 2013
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)							252,088
Performance-based shares \| December 2013 - Tranche 1
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)											50,418
Awards vested (in shares)											25,134
Estimated shares expected to vest, percent											49.00%
Performance-based shares \| December 2013 - Tranche 2
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)										49,914
Awards vested (in shares)										12,285
Estimated shares expected to vest, percent										25.00%
Performance-based shares \| December 2013 - Tranche 3
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)									49,914
Awards vested (in shares)									72,236
Estimated shares expected to vest, percent									145.00%
Performance-based shares \| February 4, 2014
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)						66,483
Performance-based shares \| February 4, 2014 \| Officer awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)										112,782
Performance-based shares \| February 4, 2014 \| Non-executive management awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)										25,619
Performance-based shares \| February 11, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)					44,962
Performance-based shares \| February 11, 2015 \| Officer awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)									14,089
Performance-based shares \| February 11, 2015 \| Non-executive management awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)									2,501
Performance-based shares \| July 27, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)				771
Performance-based shares \| July 27, 2015 \| Non-executive management awards
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)									1,079
Performance-based shares \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)			100,919
Shares expected to vest, not subject to maximum (in shares)			17,372
Performance-based shares \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)		81,939
Performance-based shares \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)	78,918
Performance-based shares \| Minimum \| December 13, 2013
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent							0.00%
Performance-based shares \| Minimum \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent			0.00%
Performance-based shares \| Minimum \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent		0.00%
Performance-based shares \| Minimum \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent	0.00%
Performance-based shares \| Maximum \| December 13, 2013
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent							200.00%
Performance-based shares \| Maximum \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent			200.00%
Performance-based shares \| Maximum \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent		200.00%
Performance-based shares \| Maximum \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent	200.00%
LTIP units
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $												$ 1.1	$ 1.1	$ 1.1
Total unrecognized compensation cost \| $												$ 1.1
Weighted average remaining vesting period												6 months
Classes of LTIP units \| class												2
LTIP Class B units
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period												5 years
LTIP units granted (shares)							226,882
Value of LTIP grants per unit (in usd per share) \| $ / shares							$ 29.19
Grant date fair value of LTIP unit awards \| $							$ 6.6