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Borrowings - Narrative (Details) |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2019 USD ($) | Jul. 30, 2016 | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) lender | Sep. 01, 2019 USD ($) | May 31, 2018 USD ($) | Jan. 31, 2010 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Amount of available borrowings under the secured revolving credit facility |  |  | $ 0 |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Ownership interest In guarantor subsidiaries |  |  | 100.00% |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  | 7.987% |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Effective period of debt instrument interest rate |  | 10 years |  |  |  |  |
Face amount modification |  |  |  |  |  |  | $ 75,000,000
Unamortized accretion |  |  | $ 33,669,000 | $ 34,703,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 250,000,000.0 |  |
Number of lenders | lender |  |  |  | 4 |  |  |
Proceeds from secured lines of credit |  |  | 250,000,000 |  |  |  |
Borrowings outstanding |  |  | 250,000,000 | $ 0 |  |  |
Letters of credit secured using cash collateral |  |  | 0 | 0 |  |  |
Letter of Credit, Cash Secured |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  | 16,700,000 | $ 14,100,000 |  |  |
Standby Letters of Credit | Standby Letters for Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 50,000,000.0 |
Letters of credit secured using cash collateral |  |  | $ 39,400,000 |  |  |  |
Standby Letters of Credit | Backstop Standby Letters of Credit |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 40,000,000 |
Junior Subordinated Notes |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Weighted average fixed interest rate of debt (percent) |  |  | 4.25% |  |  |  |
Senior Notes | Senior Unsecured Term Loans September 2022 |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |
Aggregate principal amount of debt | $ 150,000,000.0 |  |  |  |  |  |
Periodic payment | $ 50,000,000 |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 4.875% |  |  |  |  |  |

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