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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Consolidated Joint Ventures (Details) $ in Thousands		6 Months Ended
		Jun. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities
Land		$ 205,660	$ 204,162
Unbilled rent receivable		14,394	13,722
Unamortized intangible lease assets, net		26,001	26,541
Escrow, deposits, and other assets and receivables		9,312	8,023
Mortgages payable, net of unamortized deferred financing costs of $344 and $391, respectively		434,151	418,798
Accrued expenses and other liabilities		15,437	11,094
Unamortized intangible lease liabilities, net		12,546	14,013
Accumulated other comprehensive (loss) income		(2,196)	1,890
Non-controlling interests in consolidated joint ventures	[1]	$ 1,229	1,449
Consolidated Joint Venture-VIEs
Variable Interest Entities
Number of joint ventures with controlling interest | item		4
Consolidated VIEs Carrying Amount of Assets and Liabilities
Land		$ 12,158	14,722
Buildings and improvements, net of accumulated depreciation of $3,886 and $4,119, respectively		24,602	27,642
Accumulated depreciation		3,886	4,119
Cash		1,177	1,020
Unbilled rent receivable		1,248	1,211
Unamortized intangible lease assets, net		810	890
Escrow, deposits, and other assets and receivables		546	810
Mortgages payable, net of unamortized deferred financing costs of $344 and $391, respectively		24,605	26,850
Unamortized deferred financing costs		344	391
Accrued expenses and other liabilities		485	761
Unamortized intangible lease liabilities, net		630	1,694
Accumulated other comprehensive (loss) income		(66)	31
Non-controlling interests in consolidated joint ventures		$ 1,229	$ 1,449
Consolidated Joint Venture-VIEs | Minimum
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)		90.00%
Consolidated Joint Venture-VIEs | Maximum
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)		95.00%
Consolidated Joint Venture-VIEs | Sale of real estate | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Real Estate in Clemmons, NC
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)			90.00%
[1] The Company’s consolidated balance sheets include assets and liabilities of consolidated variable interest entities (“VIEs”). See Note 7. The consolidated balance sheets include the following amounts related to the Company’s consolidated VIEs: $12,158 and $14,722 of land, $24,602 and $27,642 of building and improvements, net of $3,886 and $4,119 of accumulated depreciation, $3,781 and $3,931 of other assets included in other line items, $24,605 and $26,850 of real estate debt, net, $1,115 and $2,455 of other liabilities included in other line items and $1,229 and $1,449 of non-controlling interests as of June 30, 2019 and December 31, 2018, respectively.

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