DEBT - Additional Information (Details)	9 Months Ended
Sep. 30, 2019 USD ($) property loan extension	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Number of real estate properties \| property	84
Number of real estate properties, unencumbered by mortgages \| property	49
Number of real estate properties, unencumbered used to provide credit support \| property	44
Maximum borrowing capacity	$ 6,000,000.0
Revolving lines of credit	$ 103,143,000	$ 57,500,000
Term	12 months
Line of Credit
Line of Credit Facility [Line Items]
Revolving lines of credit	$ 293,000	$ 0
Line of Credit \| London Interbank Offered Rate (LIBOR) \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.35%
Line of Credit \| London Interbank Offered Rate (LIBOR) \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.90%
Line of Credit \| Base Rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.35%
Line of Credit \| Base Rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.85%
BMO Line of Credit \| Line of Credit
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 250,000,000.0
Remaining borrowing capacity	146,900,000
Revolving lines of credit	103,100,000
BMO Line of Credit \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 250,000,000.0
Number of extensions \| extension	1
Mortgages
Line of Credit Facility [Line Items]
Number of real estate properties, serving as collateral for mortgage loans \| property	35
Number of material defaults or instances of noncompliance \| loan	0
Debt instrument face amount	$ 59,900,000
Mortgage loan, fixed rate	3.88%
Line of Credit
Line of Credit Facility [Line Items]
Term	1 year
Unsecured Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 150,000,000.0
Unsecured Senior Notes \| Note Maturing 2029
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 75,000,000.0
Mortgage loan, fixed rate	3.84%
Unsecured Senior Notes \| Note Maturing 2028
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 50,000,000.0
Mortgage loan, fixed rate	3.69%
Unsecured Senior Notes \| Term Loan Maturing 2024
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 70,000,000.0
Unsecured Senior Notes \| Term Loan Maturing 2025
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 75,000,000.0

Line Of Credit Facility, Number Of Extensions

No definition available.

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- Definition

Refers to number of loans in default

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Number Of Real Estate Properties, Collateral

+ References

No definition available.

+ Details

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- Definition

Number Of Real Estate Properties, Unencumbered

+ References

No definition available.

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- Definition

Number Of Real Estate Properties, Unencumbered, Used To Provide Credit Support

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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