Share Based Payments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Issuance (in shares)	0
Stock based compensation expense	$ 2,406	$ 1,539
Unearned Compensation	$ 3,774		$ 2,484
Shares Issued (in shares)	655,120
Shares Vested (in shares)	280,553		234,706
Annual Long Term Equity Incentive Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1,411	1,195
Unearned Compensation	3,774		$ 2,484
2016 Multi-Year Long Term Equity Incentive Program (“2016 Multi-Year EIP”) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 0	23
Terms of Share-based payment awards	On March 17, 2016, the Compensation Committee approved the 2016 Multi-Year Long Term Equity Incentive Program ("2016 Multi-Year EIP"). This program has a three-year performance period which commenced on January 1, 2016 and ends December 31, 2018. As of March 31, 2016, no shares or LTIP Units have been issued to the executive officers in settlement of 2016 Multi-Year EIP awards. Stock based compensation expense for the three months ended March 31, 2016 and 2015 was $0 and $23, respectively.
Multi-Year LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 841	167
Unearned Compensation	$ 1,486		1,548
Shareholders return as percentage of award for achievement level one (in hundredths)	37.50%
Shareholders return as percentage of award for achievement level two (in hundredths)	37.50%
Shareholders return as percentage of award for achievement level three (in hundredths)	25.00%
Shares Issued (in shares)	110,849
Shares Vested (in shares)	55,424
Multi-year LTIP Trustee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 15	15
Unearned Compensation	$ 104		$ 67
Shares Vested (in shares)	3,005		3,005
Percentage premium on retainer equity option (in hundredths)	25.00%
Restricted Common Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 122	88
Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 499		$ 491
Shares Issued (in shares)	66,753
Shares Vested (in shares)	30,863		30,863
Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 17	$ 51
Unearned Compensation	$ 248		$ 90
Shares Issued (in shares)	14,938
Shares Vested (in shares)	3,762		3,762

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The company offers to its trustees a premium equity issue offer instead of a cash retainer

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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
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Unrecognized cost of unvested share-based compensation awards.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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