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Investment in Unconsolidated Joint Ventures - Mezzanine Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)
Investment in Unconsolidated Joint Ventures
Notes receivable	$ 16,402	$ 16,427	$ 1,961
Real Estate Development Commitments, Commitments Two | Mezzanine Loans | Combination ALF, MC and ILF community | ADC Arrangement
Investment in Unconsolidated Joint Ventures
Term of loan		7 years
Number of units | item		127
Preferred return percentage		15.00%
Payments to fund mezzanine loan	2,747
Amount withheld for interest	653
Loans receivable		$ 3,400
Interest income	$ 192
Real Estate Development Commitments, Commitments One | Mezzanine Loans | Combination ALF, MC and ILF community | ADC Arrangement
Investment in Unconsolidated Joint Ventures
Number of units | item	99
Loans receivable	$ 2,900
Interest income	511
Cash interest received	302
Notes receivable	$ 3,077	$ 2,900
Real Estate Development Commitments, Commitments One | Mezzanine Loans | Combination ALF, MC and ILF community | ADC Arrangement | Minimum
Investment in Unconsolidated Joint Ventures
Stated interest rate (as a percent)	10.00%
Real Estate Development Commitments, Commitments One | Mezzanine Loans | Combination ALF, MC and ILF community | ADC Arrangement | Maximum
Investment in Unconsolidated Joint Ventures
Stated interest rate (as a percent)	15.00%

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Represents the preferred return percentage on the investment in the joint venture.

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
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Amount of loan with variable or adjustable rate of interest.

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-Publisher FASB
-Name Accounting Standards Codification
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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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-Topic 230
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