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Debt - Unsecured Revolving Lines of Credit - Additional Information (Details) - USD ($) | Dec. 31, 2018 | Feb. 20, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 300,000,000 |
Letters of credit, outstanding amount | $ 19,700,000 |  | $ 19,700,000
Revolving Credit Facility | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 150,000,000 |
Core Portfolio | Revolving Credit Facility | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt available balance | 137,700,000 |  | 96,200,000
Maximum borrowing capacity | 150,000,000 | $ 150,000,000 |
Credit facility amount outstanding | 0 |  | 41,500,000
Letters of credit, outstanding amount | $ 12,300,000 |  | $ 12,300,000

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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=6877327&loc=d3e13212-122682 + 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=6877327&loc=d3e13212-122682 + Details
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