Consolidated Statements of Changes in Capital - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of changes in accounting standard	$ (200)				$ (200)		$ (239)
Distributions	(47)	$ (47)	$ (43)	$ (43)
Buyout of Noncontrolling Interest - partially owned properties	(540)
Change in fair value of interest rate swap agreements	(5,558)	(3,476)	1,321	4,298	(9,034)	$ 5,619
Net income	7,242	11,426	11,967	11,265
Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,442,326	2,447,660	2,527,260	2,547,634	2,447,660	2,547,634
Cumulative effect of changes in accounting standard							(239)
Net proceeds from sale of Trust common shares and issuance of common units	18,316	31,020	654	5,316
Trust restricted share award grants, net	2,668	355	2,011	933
Purchase of OP Units	(717)	(105)	(303)
Conversion of OP Units			0	0
OP Units - distributions	(43,912)	(43,694)	(43,119)	(43,126)
Preferred distributions	(294)	(284)	(284)	(487)
Issuance of OP Units in connection with acquisitions	6,488
Distributions	(47)	(47)	(43)	(43)
Change in market value of Redeemable Limited Partners	(529)	(290)	(39)	194
Buyout of Noncontrolling Interest - partially owned properties	540			1,276
Change in fair value of interest rate swap agreements	(5,558)	(3,476)	1,321	4,298	(9,034)	5,619
Net income	7,242	11,426	11,967	11,265
Adjustments for Limited Partners ownership in Operating Partnership	0	0	0	0
Ending balance	2,425,443	2,442,326	2,499,425	2,527,260	2,425,443	2,499,425
Operating Partnership \| Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	10,957	14,433	18,250	13,952	14,433	13,952
Buyout of Noncontrolling Interest - partially owned properties	0
Change in fair value of interest rate swap agreements	(5,558)	(3,476)	1,321	4,298
Ending balance	5,399	10,957	19,571	18,250	5,399	19,571
Operating Partnership \| General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,364,006	2,365,072	2,434,864	2,459,220	2,365,072	2,459,220
Cumulative effect of changes in accounting standard							(239)
Net proceeds from sale of Trust common shares and issuance of common units	18,316	31,020	654	5,316
Trust restricted share award grants, net	2,668	355	2,011	933
Conversion of OP Units			817	126
OP Units - distributions	(42,674)	(42,536)	(41,927)	(41,910)
Preferred distributions	(294)	(284)	(284)	(487)
Change in market value of Redeemable Limited Partners	(529)	(290)	(39)	194
Buyout of Noncontrolling Interest - partially owned properties	0			1,276
Net income	6,980	11,057	11,587	10,908
Adjustments for Limited Partners ownership in Operating Partnership	1,560	(149)	(166)	(712)
Ending balance	2,350,033	2,364,006	2,407,517	2,434,864	2,350,033	2,407,517
Operating Partnership \| Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	66,668	67,477	73,527	73,844	67,477	73,844
Purchase of OP Units	(717)	(105)	(303)
Conversion of OP Units			(817)	(126)
OP Units - distributions	(1,238)	(1,158)	(1,192)	(1,216)
Issuance of OP Units in connection with acquisitions	6,488
Buyout of Noncontrolling Interest - partially owned properties	122
Net income	200	305	331	313
Adjustments for Limited Partners ownership in Operating Partnership	(1,560)	149	166	712
Ending balance	69,719	66,668	71,712	73,527	69,719	71,712
Operating Partnership \| Total Partners’ Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,441,631	2,446,982	2,526,641	2,547,016	2,446,982	2,547,016
Cumulative effect of changes in accounting standard							$ (239)
Net proceeds from sale of Trust common shares and issuance of common units	18,316	31,020	654	5,316
Trust restricted share award grants, net	2,668	355	2,011	933
Purchase of OP Units	(717)	(105)	(303)
OP Units - distributions	(43,912)	(43,694)	(43,119)	(43,126)
Preferred distributions	(294)	(284)	(284)	(487)
Issuance of OP Units in connection with acquisitions	6,488
Change in market value of Redeemable Limited Partners	(529)	(290)	(39)	194
Buyout of Noncontrolling Interest - partially owned properties	122			1,276
Change in fair value of interest rate swap agreements	(5,558)	(3,476)	1,321	4,298
Net income	7,180	11,362	11,918	11,221
Ending balance	2,425,151	2,441,631	2,498,800	2,526,641	2,425,151	2,498,800
Partially Owned Properties Noncontrolling Interest
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions	(47)	(47)	(43)	(43)
Buyout of Noncontrolling Interest - partially owned properties	(418)
Net income	62	64	49	44
Partially Owned Properties Noncontrolling Interest \| Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	695	678	619	618	678	618
Distributions	(47)	(47)	(43)	(43)
Buyout of Noncontrolling Interest - partially owned properties	418
Net income	62	64	49	44
Ending balance	$ 292	$ 695	$ 625	$ 619	$ 292	$ 625

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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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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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Change in the different classes of partners' capital accounts during the year due to acquisitions. 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 the sale of units. All partners include general, limited and preferred partners.

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