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Share Incentive and Other Compensation - Schedule of Unvested Shares and LTIP Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares unvested, Beginning of period (in shares)	41,327	46,499	49,899
Shares granted (in shares)	22,817	19,442	21,675
Shares vested (in shares)	(25,261)	(23,430)	(24,886)
Shares forfeited (in shares)	(428)	(1,184)	(189)
Shares unvested, End of period (in shares)	38,455	41,327	46,499
Weighted Grant-Date Fair Value
Shares unvested, Weighted average grant date fair value, Beginning of period (in dollars per share)	$ 26.92	$ 27.58	$ 25.90
Shares granted, Weighted average grant date fair value (in dollars per share)	23.65	29.85	33.35
Shares vested, Weighted average grant date fair value (in dollars per share)	30.79	30.47	29.17
Shares forfeited, Weighted average grant date fair value (in dollars per share)	27.25	32.65	35.37
Shares unvested, Weighted average grant date fair value, End of period (in dollars per share)	$ 22.44	$ 26.92	$ 27.58
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares unvested, Beginning of period (in shares)	910,099	856,877	1,020,121
Shares granted (in shares)	425,880	310,551	359,484
Shares vested (in shares)	(431,827)	(257,124)	(522,680)
Shares forfeited (in shares)	(12,266)	(205)	(48)
Shares unvested, End of period (in shares)	891,886	910,099	856,877
Weighted Grant-Date Fair Value
Shares unvested, Weighted average grant date fair value, Beginning of period (in dollars per share)	$ 28.28	$ 26.99	$ 23.92
Shares granted, Weighted average grant date fair value (in dollars per share)	26.80	31.80	34.40
Shares vested, Weighted average grant date fair value (in dollars per share)	29.72	28.27	26.08
Shares forfeited, Weighted average grant date fair value (in dollars per share)	28.57	32.49	35.37
Shares unvested, Weighted average grant date fair value, End of period (in dollars per share)	$ 26.87	$ 28.28	$ 26.99

X

- Definition

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

+ References

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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X

- 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.

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X

- Definition

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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-Publisher FASB
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-Paragraph 2
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X

- 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

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X

- 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
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-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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- Definition

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.

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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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-Publisher FASB
-Name Accounting Standards Codification
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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.

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