Consolidated Statement of Changes in Capital $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Partners' Capital [Abstract]
Distributions	$ (86)
Change in fair value of interest rate swap agreements	5,619
Net income	23,232
Operating Partnership
Partners' Capital [Abstract]
Beginning balance	2,547,634
Net proceeds from sale of Trust common shares and issuance of common units	5,970
Trust restricted share award grants, net	2,944
Purchase of OP Units	(303)
Conversion of OP Units	0
OP Units - distributions	(86,245)
Preferred distributions	(771)
Distributions	(86)
Change in market value of Redeemable Limited Partners	155
Buyout of Noncontrolling Interest - partially owned properties	1,276
Change in fair value of interest rate swap agreements	5,619
Net income	23,232
Adjustments for Limited Partners ownership in Operating Partnership	0
Ending balance	2,499,425
Operating Partnership \| Accumulated Other Comprehensive Income
Partners' Capital [Abstract]
Beginning balance	13,952
Change in fair value of interest rate swap agreements	5,619
Ending balance	19,571
Operating Partnership \| General Partner
Partners' Capital [Abstract]
Beginning balance	2,459,220
Net proceeds from sale of Trust common shares and issuance of common units	5,970
Trust restricted share award grants, net	2,944
Conversion of OP Units	943
OP Units - distributions	(83,837)
Preferred distributions	(771)
Change in market value of Redeemable Limited Partners	155
Buyout of Noncontrolling Interest - partially owned properties	1,276
Change in fair value of interest rate swap agreements	0
Net income	22,495
Adjustments for Limited Partners ownership in Operating Partnership	(878)
Ending balance	2,407,517
Operating Partnership \| Limited Partner
Partners' Capital [Abstract]
Beginning balance	73,844
Purchase of OP Units	(303)
Conversion of OP Units	(943)
OP Units - distributions	(2,408)
Net income	644
Adjustments for Limited Partners ownership in Operating Partnership	878
Ending balance	71,712
Operating Partnership \| Total Partners’ Capital
Partners' Capital [Abstract]
Beginning balance	2,547,016
Net proceeds from sale of Trust common shares and issuance of common units	5,970
Trust restricted share award grants, net	2,944
Purchase of OP Units	(303)
Conversion of OP Units	0
OP Units - distributions	(86,245)
Preferred distributions	(771)
Distributions	0
Change in market value of Redeemable Limited Partners	155
Buyout of Noncontrolling Interest - partially owned properties	1,276
Change in fair value of interest rate swap agreements	5,619
Net income	23,139
Adjustments for Limited Partners ownership in Operating Partnership	0
Ending balance	2,498,800
Partially Owned Properties Noncontrolling Interest
Partners' Capital [Abstract]
Distributions	(86)
Net income	93
Partially Owned Properties Noncontrolling Interest \| Operating Partnership
Partners' Capital [Abstract]
Beginning balance	618
Distributions	(86)
Net income	93
Ending balance	$ 625

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Partners' Capital Account, Preferred Distributions

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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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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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