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Unconsolidated Affiliates and Noncontrolling Interests (Narrative) (Details)	1 Months Ended	3 Months Ended
	Feb. 28, 2018 shares	Mar. 31, 2018 entity shares	Mar. 31, 2017 shares
Schedule of Equity Method Investments [Line Items]
Number of entities - equity method of accounting		17
Number of joint venture entities		12
Issuances of common units (in shares) | shares		700,534	330,938
Variable interest entity, number of entities		18
Variable interest entity, ownership percentage		50.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest in real estate property		10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest in real estate property		65.00%
Variable interest entity, ownership percentage		95.00%
Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Issuances of common units (in shares) | shares	915,338

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