Consolidated Statements of Changes in Capital - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions	$ 47	$ 50	$ 8,962
Distributions	(321)	(543)	(213)
Reclassification of Noncontrolling Interest - partially owned properties		8,514
Buyout of Noncontrolling Interest - partially owned properties	(2,105)	(611)
Change in fair value of interest rate swap agreements and redeemable equity - property	(1,073)	13,708
Net (loss) income	39,473	31,424	12,741
Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, ending balance	13,952
Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	1,782,318	1,076,461	569,209
Net proceeds from sale of Trust common shares and issuance of common units	844,669	766,841	545,117
Trust Restricted share award grants, net	3,821	4,434	2,908
Purchase of OP Units	(3,886)	(3,671)	(1,088)
Conversion of OP Units	0	0	0
OP Units - distributions	(158,837)	(119,007)	(70,886)
Preferred distributions	(731)	(1,857)	(1,189)
Issuance of OP Units in connection with acquisition	44,259	23,848	10,973
Contributions	47	50	8,962
Distributions	(321)	(543)	(213)
Change in market value of Redeemable Limited Partners		(245)	(73)
Reclassification of Noncontrolling Interest - partially owned properties		8,514
Buyout of Noncontrolling Interest - partially owned properties	(2,105)	(611)
Change in fair value of interest rate swap agreements and redeemable equity - property	(1,073)	13,708
Net (loss) income	39,473	31,424	12,741
Adjustments for Limited Partners ownership in Operating Partnership	0	0	0
Partners' capital, ending balance	2,547,634	1,782,318	1,076,461
Operating Partnership \| Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	13,708
Change in fair value of interest rate swap agreements and redeemable equity - property	244	13,708
Partners' capital, ending balance		13,708
Operating Partnership \| General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	1,724,743	1,021,132	534,730
Net proceeds from sale of Trust common shares and issuance of common units	844,669	766,841	545,117
Trust Restricted share award grants, net	3,821	4,434	2,908
Purchase of OP Units			0
Conversion of OP Units	930	11,619	171
OP Units - distributions	(153,970)	(115,901)	(67,542)
Preferred distributions	(731)	(1,857)	(1,189)
Issuance of OP Units in connection with acquisition	0	17,079	0
Change in market value of Redeemable Limited Partners		(245)	(73)
Buyout of Noncontrolling Interest - partially owned properties	(2,800)	53
Change in fair value of interest rate swap agreements and redeemable equity - property	(1,317)
Net (loss) income	38,146	29,981	11,788
Adjustments for Limited Partners ownership in Operating Partnership	5,729	(8,393)	(4,778)
Partners' capital, ending balance	2,459,220	1,724,743	1,021,132
Operating Partnership \| Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	43,142	45,451	33,727
Purchase of OP Units	(3,886)	(3,671)	(1,088)
Conversion of OP Units	(930)	(11,619)	(171)
OP Units - distributions	(4,867)	(3,106)	(3,344)
Preferred distributions			0
Issuance of OP Units in connection with acquisition	44,259	6,869	10,973
Change in market value of Redeemable Limited Partners			0
Buyout of Noncontrolling Interest - partially owned properties	719	0
Net (loss) income	1,136	825	576
Adjustments for Limited Partners ownership in Operating Partnership	(5,729)	8,393	4,778
Partners' capital, ending balance	73,844	43,142	45,451
Operating Partnership \| Total Partners’ Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	1,781,593	1,066,583	568,457
Net proceeds from sale of Trust common shares and issuance of common units	844,669	766,841	545,117
Trust Restricted share award grants, net	3,821	4,434	2,908
Purchase of OP Units	(3,886)	(3,671)	(1,088)
OP Units - distributions	(158,837)	(119,007)	(70,886)
Preferred distributions	(731)	(1,857)	(1,189)
Issuance of OP Units in connection with acquisition	44,259	23,948	10,973
Change in market value of Redeemable Limited Partners		(245)	(73)
Buyout of Noncontrolling Interest - partially owned properties	(2,081)	53
Change in fair value of interest rate swap agreements and redeemable equity - property	(1,073)	13,708
Net (loss) income	39,282	30,806	12,364
Partners' capital, ending balance	2,547,016	1,781,593	1,066,583
Partially Owned Properties Noncontrolling Interest
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions	47	50	8,962
Distributions	(321)	(543)	(213)
Reclassification of Noncontrolling Interest - partially owned properties		8,514
Buyout of Noncontrolling Interest - partially owned properties	(24)	(664)
Net (loss) income	191	618	377
Partially Owned Properties Noncontrolling Interest \| Operating Partnership
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' capital, beginning balance	725	9,878	752
Issuance of OP Units in connection with acquisition	0	(100)
Contributions	47	50	8,962
Distributions	(321)	(543)	(213)
Reclassification of Noncontrolling Interest - partially owned properties		8,514
Buyout of Noncontrolling Interest - partially owned properties	(24)	(664)
Net (loss) income	191	618	377
Adjustments for Limited Partners ownership in Operating Partnership			0
Partners' capital, ending balance	$ 618	$ 725	$ 9,878

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Partners' Capital Account, Preferred Distributions

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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 of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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

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