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Share-based Compensation Arrangement by Share-based Payment Award, Total Shareholder Return Threshold

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Unrecognized compensation cost related to long term incentive plan units.

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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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Unrecognized cost of unvested share-based compensation awards.

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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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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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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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Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Percentage of vesting of share-based compensation awards.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, $ in Thousands						1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 28, 2016 $ / shares shares	Jun. 01, 2015 $ / shares shares	Jun. 04, 2014 officer shares	Sep. 30, 2013 officer shares	May 17, 2013 shares	Jan. 31, 2016 shares	Jan. 31, 2015 shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense valuation of performance-based shares (in dollars per share) \| $ / shares												$ 21.21	$ 13.17
Total unrecognized compensation cost related to LTIP Units \| $								$ 2,903		$ 2,903		$ 2,166
Independent Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common share issued as compensation for services performed (in shares)						26,488	14,113			19,296
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)					3,000,000
Vesting period for share awards under equity					3 years
2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days preceding the reporting date for which average of closing price of common shares is taken										10 days
Common shares available for issuance (in shares)								1,875,052		1,875,052
Time-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share awards under equity										3 years
Performance-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share awards under equity										3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $								$ 1,168		$ 1,168		$ 2,131
Weighted - average period for recognition of unrecognized compensation costs										1 year 2 months 14 days
Compensation expense, recognized \| $								316	$ 413	$ 963	$ 1,182
Number of shares, granted (in shares)										0		85,254
Long Term Incentive Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share awards under equity		3 years
Weighted - average period for recognition of unrecognized compensation costs										2 years 5 months 7 days
Compensation expense, recognized \| $								$ 319	$ 197	$ 916	$ 509
Initial award vesting rights, percentage		50.00%
Annual award vesting rights after initial portion, percentage		25.00%
Termination period upon change in control		18 months
Distribution entitlement, percentage		10.00%
Long Term Incentive Plan Units \| Awarded June 1, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)		183,300
Grants in period, intrinsic value, amount per share (in dollars per share) \| $ / shares		$ 14.13
Long Term Incentive Plan Units \| Officer \| Awarded September 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards achieving full parity (in shares)				26,250
Number of recipients (in officers) \| officer				1
Awards vested to date, percentage								100.00%		100.00%
Long Term Incentive Plan Units \| Officer \| Awarded June 4, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards achieving full parity (in shares)			231,525
Number of recipients (in officers) \| officer			2
Awards vested to date, percentage								100.00%		100.00%
Long Term Incentive Plan Units, Absolute TSR Component
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of awards granted, percentage		60.00%
Long Term Incentive Plan Units, Absolute TSR Component \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of awards to be granted if conditions are met, percentage		37.50%
Total shareholder return threshold		25.00%
Long Term Incentive Plan Units, Absolute TSR Component \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shareholder return threshold		50.00%
Long Term Incentive Plan Units, Relative TSR Component
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of awards granted, percentage		40.00%
Long Term Incentive Plan Units, Relative TSR Component \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of awards to be granted if conditions are met, percentage		37.50%
Index percentile threshold		50.00%
Long Term Incentive Plan Units, Relative TSR Component \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Index percentile threshold		75.00%
Long Term Incentive Plan Units, Time-Based \| Awarded January 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)	72,966
Grants in period, intrinsic value, amount per share (in dollars per share) \| $ / shares	$ 16.69
Long Term Incentive Plan Units, Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution entitlement, percentage	10.00%
Long Term Incentive Plan Units, Performance-Based \| Awarded January 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)	39,285
Total shareholder return threshold	8.00%
Grants in period, intrinsic value, amount per share (in dollars per share) \| $ / shares	$ 11.09
Annual vesting percentage	33.33%