Consolidated Statements of Changes in Capital - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Jan. 01, 2019
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of changes in accounting standard			$ (147)	$ (239)
Distributions	$ (41)	$ (47)
Adjustment for Noncontrolling Interests ownership in Operating Partnership	(9,986)	(3,476)
Net income	14,885	11,426
Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,480,984	2,447,660
Cumulative effect of changes in accounting standard			(147)	(239)
Net proceeds from sale of Trust common shares and issuance of common units	239,232	31,020
Trust restricted share award grants, net	(201)	355
Purchase of OP Units	(93)	(105)
Conversion of OP Units		0
OP Units - distributions	(47,911)	(43,694)
Preferred distributions	(317)	(284)
Distributions	(41)	(47)
Change in market value of Redeemable Limited Partners	(980)	(290)
Adjustment for Noncontrolling Interests ownership in Operating Partnership	(9,986)	(3,476)
Net income	14,885	11,426
Adjustments for Limited Partners ownership in Operating Partnership	0	0
Ending balance	2,675,425	2,442,326
Operating Partnership \| Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	4,321	14,433
Adjustment for Noncontrolling Interests ownership in Operating Partnership	(9,986)	(3,476)
Net income		0
Ending balance	(5,665)	10,957
Operating Partnership \| General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,404,627	2,365,072
Cumulative effect of changes in accounting standard			(147)	(239)
Net proceeds from sale of Trust common shares and issuance of common units	239,232	31,020
Trust restricted share award grants, net	(201)	355
Conversion of OP Units		0
OP Units - distributions	(46,636)	(42,536)
Preferred distributions	(317)	(284)
Change in market value of Redeemable Limited Partners	(980)	(290)
Adjustment for Noncontrolling Interests ownership in Operating Partnership		0
Net income	14,414	11,057
Adjustments for Limited Partners ownership in Operating Partnership	(2,038)	(149)
Ending balance	2,607,954	2,364,006
Operating Partnership \| Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	71,697	67,477
Cumulative effect of changes in accounting standard				0
Purchase of OP Units	(93)	(105)
Conversion of OP Units		0
OP Units - distributions	(1,275)	(1,158)
Net income	404	305
Adjustments for Limited Partners ownership in Operating Partnership	2,038	149
Ending balance	72,771	66,668
Operating Partnership \| Total Partners’ Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,480,645	2,446,982
Cumulative effect of changes in accounting standard			$ (147)	$ (239)
Net proceeds from sale of Trust common shares and issuance of common units	239,232	31,020
Trust restricted share award grants, net	(201)	355
Purchase of OP Units	(93)	(105)
OP Units - distributions	(47,911)	(43,694)
Preferred distributions	(317)	(284)
Change in market value of Redeemable Limited Partners	(980)	(290)
Adjustment for Noncontrolling Interests ownership in Operating Partnership	(9,986)	(3,476)
Net income	14,818	11,362
Adjustments for Limited Partners ownership in Operating Partnership		0
Ending balance	2,675,060	2,441,631
Partially Owned Properties Noncontrolling Interest
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions	(41)	(47)
Net income	67	64
Partially Owned Properties Noncontrolling Interest \| Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	339	678
Distributions	(41)	(47)
Net income	67	64
Adjustments for Limited Partners ownership in Operating Partnership		0
Ending balance	$ 365	$ 695

Partners' Capital Account, Preferred Distributions

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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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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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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Value of units that were previously issued and have been repurchased during the year.

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Amount of partners' capital (deficit), including portions attributable to both the parent and noncontrolling interests. Excludes temporary equity and is sometimes called permanent equity.

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Amount of increase (decrease) in partners' capital classified as other.

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