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Debt - Senior Unsecured Credit Facility and Unsecured Term Loans (Details) $ in Thousands		3 Months Ended		9 Months Ended			10 Months Ended
	Jan. 20, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Apr. 01, 2021	Dec. 31, 2020 USD ($)	Aug. 14, 2020 USD ($)
Line of Credit Facility [Line Items]
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent)					50.00%
Senior unsecured credit facility		$ 0			$ 0				$ 55,000
Minimum liquidity covenant	$ 125,000						$ 100,000
Covenant, acquisition limitation							$ 300,000
Maximum leverage ratio (as a percent)							0.60	0.65
Unencumbered leverage ratio							60.00%	65.00%
Basis spread on variable rate	2.55%
Maximum annual preferred dividends	$ 25,000									$ 17,500
Minimum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)					0.20%
Minimum | Testing Period One | Forecast
Line of Credit Facility [Line Items]
Unencumbered implied debt service coverage ratio				1.00
Minimum | Testing Period Two | Forecast
Line of Credit Facility [Line Items]
Unencumbered implied debt service coverage ratio				1.00
Minimum | Testing Period Three | Forecast
Line of Credit Facility [Line Items]
Unencumbered implied debt service coverage ratio				1.10
Minimum | Testing Periods Thereafter | Forecast
Line of Credit Facility [Line Items]
Unencumbered implied debt service coverage ratio				1.20
Maximum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)					0.30%
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		400,000			$ 400,000
Senior unsecured credit facility		0			0				55,000
Interest and unused credit facility fees		300	$ 1,100		2,000	$ 3,600
Interest incurred on the facility		3,800	$ 3,700		$ 11,100	$ 9,800
Revolving Credit Facility | Line of Credit | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.40%				2.55%		2.40%
Revolving Credit Facility | Line of Credit | Minimum | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate							0.25%
Unsecured Term Loan due July 2024 | Unsecured Term Loan
Line of Credit Facility [Line Items]
Principal balance		350,000			$ 350,000				350,000
Unsecured Term Loan due July 2024 | Unsecured Term Loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.40%
Unsecured Term Loan Due October 2023 | Unsecured Term Loan
Line of Credit Facility [Line Items]
Principal balance		$ 50,000			$ 50,000				$ 50,000
Unsecured Term Loan Due October 2023 | Unsecured Term Loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.40%		2.35%

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Debt Instrument, Covenant, Acquisition Limitation

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Debt Instrument, Covenant, Maximum Annual Preferred Dividends

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Debt Instrument, Unencumbered Implied Debt Service Coverage Ratio

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Debt Instrument, Unencumbered Leverage Ratio

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Line of credit facility interest and commitment fee amount.

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Percent of Unused Portion Line of Credit Facility Triggering Commitment Fee Percentage

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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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Total interest costs incurred during the period and either capitalized or charged against earnings.

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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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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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