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v3.22.4

Indebtedness (Details) - USD ($) | Dec. 31, 2022 | Apr. 01, 2022 | Mar. 31, 2022 | Jan. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Unsecured borrowings, limit increase |  | $ 500,000,000 |  |  |
Standby Letters of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured borrowings |  | 50,000,000 |  |  |
Subsidiary Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Value | $ 6,478,000 |  |  |  |
Carrying Value | 6,478,000 |  |  |  | $ 10,564,000
Repayments in 2020 | 2,000,000 |  |  |  |
Repayments thereafter | 5,000,000 |  |  |  |
Total senior notes and other debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Value | 1,826,478,000 |  |  |  |
Carrying Value | $ 1,828,823,000 |  |  |  | 2,259,416,000
Senior Notes | Senior Notes due January 1, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 8.70% |  |  | 8.70% |
Face Value | $ 0 |  |  | $ 77,000,000 |
Carrying Value | $ 0 |  |  |  | 76,503,000
Senior Notes | Senior Notes due March 15, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 4.625% |  | 4.625% |  |
Face Value | $ 0 |  | $ 350,000,000 |  |
Carrying Value | $ 0 |  |  |  | 349,923,000
Senior Notes | Senior Notes due February 15, 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 6.25% |  |  |  |
Face Value | $ 250,000,000 |  |  |  |
Carrying Value | $ 248,446,000 |  |  |  | 248,336,000
Senior Notes | Senior Notes due August 1, 2044 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 4.75% |  |  |  |
Face Value | $ 350,000,000 |  |  |  |
Carrying Value | $ 346,020,000 |  |  |  | 345,836,000
Senior Notes | Senior Notes Due May 12 2050 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 4.00% |  |  |  |
Face Value | $ 470,000,000 |  |  |  |
Carrying Value | $ 490,721,000 |  |  |  | 491,478,000
Senior Notes | Senior Notes Due September 30, 2061 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 3.15% |  |  |  |
Face Value | $ 350,000,000 |  |  |  |
Carrying Value | $ 342,945,000 |  |  |  | 342,761,000
Senior Notes | Senior Notes Due March 30, 2052 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 3.55% |  |  |  |
Face Value | $ 400,000,000 |  |  |  |
Carrying Value | 394,213,000 |  |  |  | 394,015,000
Total subordinated debentures |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Value | 1,035,000,000 |  |  |  |
Carrying Value | $ 1,008,371,000 |  |  |  | 1,007,652,000
Total subordinated debentures | Subordinated Debt due March 30, 2058 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 5.70% |  |  |  |
Face Value | $ 185,000,000 |  |  |  |
Carrying Value | $ 179,328,000 |  |  |  | 179,166,000
Total subordinated debentures | Subordinated Debt due December 30, 2059 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 5.10% |  |  |  |
Face Value | $ 300,000,000 |  |  |  |
Carrying Value | $ 291,179,000 |  |  |  | 290,941,000
Total subordinated debentures | Subordinated Debt Due September 30 2060 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 4.25% |  |  |  |
Face Value | $ 250,000,000 |  |  |  |
Carrying Value | $ 244,523,000 |  |  |  | 244,378,000
Total subordinated debentures | Subordinated Debt Due March 30, 2061 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate | 4.125% |  |  |  |
Face Value | $ 300,000,000 |  |  |  |
Carrying Value | $ 293,341,000 |  |  |  | $ 293,167,000
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured borrowings |  | $ 300,000,000 |  |  |

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