Share Based Payments (Summary Of Unvested Share Awards Issued To Executives And Employees) (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Unvested Share Awards [Abstract]
Shares Issued (in shares)	110,849
Shares Vested (in shares)	110,849,000
Unearned Compensation	$ 1,568,000	$ 1,548,000
LTIP Units [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	655,120
Shares Vested (in shares)	444,911	206,708
Unearned Compensation	$ 1,550,000	$ 2,484,000
LTIP Units [Member] \| Issued 12-23-2014 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	258,899
Vesting Period	5 years
Vesting Schedule (in hundredths)	33.30%
Shares Vested (in shares)	172,599	86,299
Unearned Compensation	$ 457,000	$ 1,553,000
Restricted Share Awards [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	90,562
Shares Vested (in shares)	51,230	30,863
Unearned Compensation	$ 505,000	$ 491,000
Restricted Share Awards [Member] \| Original Year Of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	30,070
Vesting Period	2 years
Vesting Schedule (in hundredths)	50.00%
Shares Vested (in shares)	497
Unearned Compensation	$ 348,000
Restricted Share Awards [Member] \| Original Year Of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	23,492
Shares Vested (in shares)	13,733	600
Unearned Compensation	$ 157,000	$ 419,000
Restricted Share Awards [Member] \| Original Year Of Issuance Date 2014 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	11,455
Vesting Period	2 years
Vesting Schedule (in hundredths)	50.00%
Shares Vested (in shares)	11,455	6,619
Unearned Compensation		$ 54,000
Restricted Share Awards [Member] \| Original Year Of Issuance Date 2013 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	11,899
Share Price on date of grant (in dollars per share)	$ 22.560
Shares Vested (in shares)	11,899	11,199
Unearned Compensation		$ 7,000
Restricted Share Awards [Member] \| Original Year Of Issuance Date 2012 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	13,646
Share Price on date of grant (in dollars per share)	$ 21.120
Shares Vested (in shares)	13,646	12,445
Unearned Compensation		$ 11,000
Minimum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 18.020
Minimum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 21.760
Vesting Period	2 years
Vesting Schedule (in hundredths)	25.00%
Minimum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2014 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 26.000
Minimum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2013 [Member]
Unvested Share Awards [Abstract]
Vesting Period	2 years
Vesting Schedule (in hundredths)	25.00%
Minimum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2012 [Member]
Unvested Share Awards [Abstract]
Vesting Period	2 years
Vesting Schedule (in hundredths)	25.00%
Maximum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 21.11
Maximum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 28.09
Vesting Period	4 years
Vesting Schedule (in hundredths)	50.00%
Maximum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2014 [Member]
Unvested Share Awards [Abstract]
Share Price on date of grant (in dollars per share)	$ 27.00
Maximum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2013 [Member]
Unvested Share Awards [Abstract]
Vesting Period	4 years
Vesting Schedule (in hundredths)	50.00%
Maximum [Member] \| Restricted Share Awards [Member] \| Original Year Of Issuance Date 2012 [Member]
Unvested Share Awards [Abstract]
Vesting Period	4 years
Vesting Schedule (in hundredths)	50.00%
2015 Annual Long Term Equity Incentive Program (“2015 Annual EIP”) [Member] \| LTIP Units [Member] \| Issued 03-30-2016 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	183,396
Vesting Period	3 years
Vesting Schedule (in hundredths)	25.00%
Shares Vested (in shares)	91,696
Unearned Compensation	$ 868,000
2014 Annual Long Term Equity Incentive Program (“2014 Annual EIP”) [Member] \| LTIP Units [Member] \| Issued 03-30-2015 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	128,832
Vesting Period	3 years
Vesting Schedule (in hundredths)	25.00%
Shares Vested (in shares)	96,623	64,415
Unearned Compensation	$ 225,000	$ 758,000
2013 Annual Long Term Equity Incentive Program (“2013 Annual EIP”) [Member] \| LTIP Units [Member] \| Issued 12-23-2014 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	83,993
Vesting Period	3 years
Vesting Schedule (in hundredths)	25.00%
Shares Vested (in shares)	83,993	55,994
Unearned Compensation		$ 173,000
Approved aggregate number of LTIP units to certain officers	487,081
2016 Multi-Year Long Term Equity Incentive Program (“2016 Multi-Year EIP”) [Member] \| Compensation Committee Approval Date March 17, 2016 [Member]
Unvested Share Awards [Abstract]
Performance Period	1/1/2016 to 12/31/2018
Unearned Compensation	$ 888,000
2015 Multi-Year Long Term Equity Incentive Program (“2015 Multi-Year EIP”) [Member] \| Compensation Committee Approval Date March 18, 2015 [Member]
Unvested Share Awards [Abstract]
Performance Period	1/1/2015 to 12/31/2017
Unearned Compensation	$ 397,000	596,000
2014 Multi-Year Long Term Equity Incentive Program (“2014 Multi-Year EIP”) [Member] \| Compensation Committee Approval Date April 11, 2014 [Member]
Unvested Share Awards [Abstract]
Performance Period	1/1/2014 to 12/31/2016
Unearned Compensation	$ 283,000	567,000
2013 Multi-Year Long Term Equity Incentive Program (“2013 Multi-Year EIP”) [Member] \| Compensation Committee Approval Date April 15, 2013 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	110,849
LTIP Issuance Date	Mar. 30, 2016
Performance Period	1/1/2013 to 12/31/2015
Shares Vested (in shares)	110,849,000
Unearned Compensation		385,000
Multi-Year LTIP [Member]
Unvested Share Awards [Abstract]
Unearned Compensation	$ 1,568,000	$ 1,548,000
Multi-Year LTIP Trustee [Member]
Unvested Share Awards [Abstract]
Shares Vested (in shares)	5,505	3,005
Unearned Compensation	$ 167,000	$ 67,000
Multi-Year LTIP Trustee [Member] \| Issued 03-30-2016 [Member]
Unvested Share Awards [Abstract]
Shares Issued (in shares)	2,500
Vesting Period	3 years
Vesting Schedule (in hundredths)	33.00%
Shares Vested (in shares)	835
Unearned Compensation	$ 35,000

Long Term Incentive Plan, Issuance Date

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Long Term Incentive Plan, Performance Period

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- Definition

Description of award terms as to the percent of share award no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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

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

+ 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)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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