LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) Investment loan	Dec. 31, 2017 USD ($) loan	Aug. 17, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| Investment	22
Book value of loans	$ 96,492
Loan loss reserve	1,258	$ 97
Principal balance of impaired loan	$ 1,300	$ 1,400
Loan receivable investment with recognized interest income \| loan	1
Book value of loan receivable investment with recognized interest income	$ 4,300
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| loan	1	0
Provision for loan losses	$ 700	$ 4,800
Number of loans with provisions recorded \| loan		2
Number of loans on nonaccrual status \| loan	2	1
Value of loans on nonaccrual status	$ 1,300	$ 0
Portfolio-Based Loan Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in provision	500	300
Loan loss reserve	600	100
Specific Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan loss reserve	$ 700	0
Care Capital Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| loan			18
Book value of loans			$ 83,300
Fair value of loans receivable			$ 58,200
Care Capital Properties \| Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| loan			8
Book value of loans			$ 36,300
Fair value of loans receivable			11,300
Accretable yield			$ 3,500
Number of loans with deteriorated credit quality repaid \| loan	1
Outstanding principal balance	$ 4,200	$ 10,000

Financing Receivable, Number Of Loans, 90 Days Past Due And Still Accruing

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Loans and Leases Receivable, Number of Loans

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Loans and Leases Receivable, Number of Loans, Nonaccrual Status

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Loans and Leases Receivable, Number of Loan, Provision Recorded

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) of allowance reserve for credit loss.

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The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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