Organization and Principles of Consolidation Variable Interest Entities (Details)

9 Months Ended

Sep. 30, 2018

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Accounting Policies [Abstract]

Schedule of Variable Interest Entities

The major classes of assets, liabilities, and non-controlling equity interests held by the Company's consolidated VIEs, exclusive of the Operating Partnership as a whole, are as follows:

(in thousands)	September 30, 2018		December 31, 2017
Assets
Net real estate investments	$	163,283	172,736
Cash and cash equivalents	4,635		4,993
Liabilities
Notes payable	18,403		16,551
Equity
Limited partners’ interests in consolidated partnerships	17,263		17,572

Variable Interest Entity [Line Items]

Document Period End Date

Sep. 30, 2018

Minimum [Member]

Variable Interest Entity [Line Items]

Equity Method Investment, Accretion Period

10 years

Maximum [Member]

Variable Interest Entity [Line Items]

Equity Method Investment, Accretion Period

40 years

Partially Owned Properties [Member]

Variable Interest Entity [Line Items]

Number of Real Estate Properties

131

Consolidated Properties [Member]

Variable Interest Entity [Line Items]

Number of Real Estate Properties

11