Debt - Schedule of Unsecured Credit Facilities (Parentheticals) (Details) - USD ($)	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Debt Details [Line Items]
Debt issuance costs, net	$ 6,870,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Details [Line Items]
Debt Instrument, Basis of Variable Rate	0.08%	0.14%
Outstanding Variable-Rate Debt Effectively Fixed By Interest Rate Swaps [Member]
Debt Details [Line Items]
Derivative, notional amount	$ 770,000,000.0	$ 745,000,000.0
Unsecured Credit Facility
Debt Details [Line Items]
Interest rate increase above highest rate	0.15%
Revolving Credit Facilities [Member]
Debt Details [Line Items]
Debt issuance costs, net	$ 1,400,000	$ 2,100,000
Line of credit facility, maximum borrowing capacity	$ 425,000,000
Debt instrument, maturity date, description	maturity date may be extended up to one year
Debt instrument extended maturity date term	1 year
Debt instrument extended maturity date	Jul. 27, 2023

Debt (Details) [Line Items]

No definition available.

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- Definition

The reference rate percentage as of the balance sheet date used to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Debt instrument extended maturity date.

+ References

No definition available.

+ Details

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- Definition

Debt instrument extended maturity date term.

+ References

No definition available.

+ Details

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- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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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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