Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Investment under secured debt book value net.

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Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option

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Line of Credit Facility, Unencumbered Properties

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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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

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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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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.

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Weighted average interest rate of debt outstanding.

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Nominal or face amount used to calculate payment on derivative.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Debt - Narrative (Details)		12 Months Ended
Debt - Narrative (Details)	Sep. 12, 2019 USD ($)	Dec. 31, 2019 USD ($) derivative_instrument loan	Dec. 31, 2018 USD ($) loan derivative_instrument	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ (189,000)	$ 0	$ 0
Credit facility, amount outstanding		0	19,000,000
Interest rate cap notional value		$ 100,000,000.0
Weighted average fixed annual rate		3.70%
Interest rate cap [Member]
Debt Instrument [Line Items]
Interest rate cap notional value		$ 100,000,000.0	$ 150,000,000.0
Credit facility [Member]
Debt Instrument [Line Items]
Unencumbered properties, percent		60.00%
Cash flow hedging [Member] \| Interest rate cap [Member]
Debt Instrument [Line Items]
Number of interest rate cap transactions \| derivative_instrument		2	3
Senior unsecured notes [Member]
Debt Instrument [Line Items]
Weighted average fixed annual rate		3.80%
Senior unsecured notes [Member] \| December 2029 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000,000.0	$ 100,000,000.0
Debt instrument, term	10 years
Debt instrument, interest rate	3.14%
Senior unsecured notes [Member] \| September 2022 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		50,000,000.0
Senior unsecured notes [Member] \| July 2024 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		100,000,000.0
Senior unsecured notes [Member] \| July 2026 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		50,000,000.0
Senior unsecured notes [Member] \| October 2027 senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 50,000,000.0
Term loan [Member]
Debt Instrument [Line Items]
Long-term debt			$ 150,000,000.0
Weighted average fixed annual rate		3.00%
Term loan [Member] \| Credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%
Term loan [Member] \| Credit facility [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%
Term loan [Member] \| Credit facility [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.70%
Term loan [Member] \| August 2021 term loan [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 50,000,000.0
Loss on extinguishment of debt	$ (200,000)
Term loan [Member] \| January 2022 term loan [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			100,000,000.0
Line of credit [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity, higher borrowing capacity option		$ 600,000,000.0
Line of credit [Member] \| Credit facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Line of credit [Member] \| Credit facility [Member] \| Thirty-day LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Line of credit [Member] \| Credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.05%
Line of credit [Member] \| Credit facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, facility fee, percentage		0.15%
Line of credit [Member] \| Credit facility [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.05%
Line of credit [Member] \| Credit facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, facility fee, percentage		0.30%
Line of credit [Member] \| Credit facility [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Line of credit [Member] \| October 2022 unsecured revolving credit facility [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000.0
Line of credit [Member] \| August 2020 unsecured revolving credit facility [Member] \| Credit facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding		$ 0	$ 19,000,000.0
Mortgage loans payable [Member]
Debt Instrument [Line Items]
Number of mortgage loans payable \| loan		2	3
Weighted average fixed annual rate		4.10%	4.10%
Secured loan		$ 44,300,000	$ 45,800,000
Total net investment book value of properties securing the debt		$ 114,900,000	$ 153,700,000