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Share based compensation plan.

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

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

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Share-Based Compensation Plan (Details Textual) - USD ($) $ / shares in Units, $ in Millions									3 Months Ended		6 Months Ended
	Feb. 10, 2016	Jul. 27, 2015	Feb. 11, 2015	Feb. 04, 2014	Dec. 13, 2013	Jan. 30, 2013	Feb. 08, 2012	Dec. 14, 2009	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									117,201	40,111	117,201	0
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									160,286		160,286
Operating Partnership outstanding									236,351		236,351		236,351
LTIP units, vested									54,845		54,845
Restricted Stock [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Allocated Share-based Compensation Expense									$ 0.4	$ 0.4	$ 0.9	$ 0.8
Total unrecognized compensation cost									3.3		$ 3.3
Weighted average remaining vesting period (in years)											2 years 4 months
Share-based equity award grant											67,280
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											52,452
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]
Allocated Share-based Compensation Expense									1.3	1.5	$ 2.5	3.0
Total unrecognized compensation cost									12.0		$ 12.0
Weighted average remaining vesting period (in years)											2 years
Performance Shares [Member] \| February 2012 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant							72,056
Performance Shares [Member] \| February 2012 [Member] \| Officer Awards [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											120,016
Performance Shares [Member] \| February 2012 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											87,556
Performance Shares [Member] \| January 2013 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant						72,118
Performance Shares [Member] \| January 2013 [Member] \| Officer Awards [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											120,730
Performance Shares [Member] \| January 2013 [Member] \| Nonexecutive management award [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											56,562
Performance Shares [Member] \| December 2013 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant					252,088
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											25,134
Performance Shares [Member] \| December 2013 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum					0.00%
Performance Shares [Member] \| December 2013 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum					200.00%
Performance Shares [Member] \| December 2013 - Tranche 1 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant											50,418
Estimated Shares Expected to Vest Minimum and Maximum											49.00%
Performance Shares [Member] \| February 2014 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant				66,483
Shares Expected to Vest Not Subject to Maximum				10,092
Performance Shares [Member] \| February 2014 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum				0.00%
Performance Shares [Member] \| February 2014 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum				200.00%
Performance Shares [Member] \| February 2015 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant			44,962
Shares Expected to Vest Not Subject to Maximum			8,559
Performance Shares [Member] \| February 2015 [Member] \| Minimum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum			0.00%
Performance Shares [Member] \| February 2015 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum			200.00%
Performance Shares [Member] \| July 2015 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant		771
Performance Shares [Member] \| February 2016 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based equity award grant	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 Minimum and Maximum	0.00%
Performance Shares [Member] \| February 2016 [Member] \| Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Estimated Shares Expected to Vest Minimum and Maximum	200.00%
LongTermIncentivePartnershipUnitsClassA [Member]
Share-Based Compensation Plan (Textual) [Abstract]
LTIP Units Granted								929,099
Value of LTIP grants per share								$ 8.50
LongtermincentivepartnershipunitsclassB [Member]
Share-Based Compensation Plan (Textual) [Abstract]
LTIP Units Granted					226,882
Value of LTIP grants per share					$ 29.19
Grant date fair value of performance-based equity awards					$ 6.6
Long Term Incentive Partnership Units [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Allocated Share-based Compensation Expense									0.3	$ 0.3	$ 0.6	$ 0.6
Total unrecognized compensation cost									$ 3.8		$ 3.8
Weighted average remaining vesting period (in years)											1 year 10 months