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Short-term Debt - 2018 Bank of America Credit Facility (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2016 | Jun. 30, 2018 | Dec. 31, 2019 | Oct. 31, 2019 | Jun. 30, 2019 | Oct. 31, 2018
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 23,250,000 |  | $ 23,647,000 |
Bank of America | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.75% |  | 4.50% |
Revolving Credit Facility And Other Financial Accommodations | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 250,000,000.0 |  |  |  |  |  |
Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 5,000,000.0 |  |  |  | $ 15,000,000.0 |  |
Line of credit facility, expiration period | 364 days |  |  |  |  |  |
Line of credit facility, commitment fee amount |  |  | $ 3,200,000 |  |  |  |
Short-term debt |  |  |  | $ 0 |  | $ 1,100,000 |
Credit facility, remaining borrowing capacity |  |  |  |  |  | $ 243,600,000 |
Revolving Credit Facility | Bank of America | Standby Letters of Credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | 6,400,000 |  | $ 3,200,000
Line of credit facility, fair value of amount outstanding |  |  |  |  | $ 6,400,000 |  | $ 3,200,000
Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 400,000,000.0 |  |  |  |  |  |
Credit facility, term |  | 5 years |  |  |  |  |
LIBOR | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate (as a percent) | 2.75% |  |  |  |  |  |
Minimum | LIBOR | Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate (as a percent) | 1.50% |  |  |  |  |  |
Maximum | LIBOR | Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate (as a percent) | 2.00% |  |  |  |  |  |

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