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Debt - Unsecured Revolving Lines of Credit - Additional Information (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Letters of credit, outstanding amount | $ 33,800,000 | $ 35,600,000
Revolving Credit Facility | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 250,000,000.0 |
Core Portfolio | Revolving Credit Facility | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Debt available balance | 136,600,000 | 101,100,000
Maximum borrowing capacity | 250,000,000.0 |
Credit facility amount outstanding | 105,400,000 | 138,400,000
Letters of credit, outstanding amount | $ 8,000,000.0 | $ 10,500,000

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + 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 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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