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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 28, 2018	Dec. 31, 2017	Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ (461)		$ 2,415
Other	556		556
Investments in and advances to unconsolidated affiliates	262,410		302,070
Distributions in excess of income from, and investments in, unconsolidated affiliates	$ 15,623		15,292
KLA Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	10.50%
Equity method investments	$ 0		0
Fund III Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 21		167
Self Storage Management
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	95.00%
Equity method investments	$ 206		206
Fund III
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 227		373
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 3,236		48,335
Fund IV Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 14,540		20,199
650 Bald Hill Road
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 12,880		13,609
Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 30,656		$ 82,143
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%		61.11%	22.22%
Equity method investments	$ 231,432	$ 22,300	$ 216,583	$ 61,600
Core Portfolio | 840 N. Michigan
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	88.43%
Equity method investments	$ 65,013		69,846
Core Portfolio | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	20.00%
Equity method investments	$ 32,458		35,041
Core Portfolio | Gotham Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Equity method investments	$ 29,550		29,416
Core Portfolio | Town Center
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%
Equity method investments	$ 99,758		78,801
Core Portfolio | Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 4,653		3,479
Core Portfolio | Crossroads
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Distributions in excess of income from, and investments in, unconsolidated affiliates	$ 15,623		$ 15,292

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