Share Based Payments (Summary Of Share Based Compensation Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested balance at beginning of the period (in shares)	450,903	107,217	210,209
Granted (in shares)	530,281	589,106	183,784
Vested (in shares)	(539,983)	(245,420)	(286,776)
Forfeited (in shares)	0	0	0
Unvested balance at end of the period (in shares)	441,201	450,903	107,217
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, unvested balance at the beginning of the period (in dollars per share)	$ 17.95	$ 19.63	$ 22.21
Weighted average grant date fair value, unvested balance, granted (in dollars per share)	18.00	17.91	18.53
Weighted average grant date fair value, unvested balance, vested (in dollars per share)	(17.97)	(18.59)	(20.82)
Weighted average grant date fair value, unvested balance at the end of the period (in dollars per share)	$ 17.99	$ 17.95	$ 19.63
Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested balance at beginning of the period (in shares)	91,859	86,833	54,761
Granted (in shares)	83,805	76,314	79,712
Vested (in shares)	(80,924)	(70,713)	(44,585)
Forfeited (in shares)	(2,638)	(575)	(3,055)
Unvested balance at end of the period (in shares)	92,102	91,859	86,833
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, unvested balance at the beginning of the period (in dollars per share)	$ 19.56	$ 18.58	$ 21.10
Weighted average grant date fair value, unvested balance, granted (in dollars per share)	16.40	19.56	18.21
Weighted average grant date fair value, unvested balance, vested (in dollars per share)	(19.11)	(18.38)	(21.01)
Weighted average grant date fair value, unvested balance, forfeited (in dollars per share)	19.78	18.04	18.49
Weighted average grant date fair value, unvested balance at the end of the period (in dollars per share)	$ 17.07	$ 19.56	$ 18.58
Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested balance at beginning of the period (in shares)	0	0	0
Granted (in shares)	42,533	34,752	32,674
Vested (in shares)	(42,533)	(34,752)	(32,674)
Forfeited (in shares)		0	0
Unvested balance at end of the period (in shares)	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, unvested balance, granted (in dollars per share)	$ 16.01	$ 19.64	$ 18.16
Weighted average grant date fair value, unvested balance, vested (in dollars per share)	$ (16.01)	$ (19.64)	$ (18.16)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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).

+ References

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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