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Statements of Cash Flow (Tables) | 12 Months Ended
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Dec. 31, 2021
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures |
($ in thousands) |  | 2021 |  | 2020 |  | 2019
Cash paid during the period for: |  |  |  |  |  |
Interest |  | $ | 28,930 |  |  | 30,464 |  |  | 25,089 |
Federal income tax |  | 100,000 |  |  | 47,000 |  |  | 55,825 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |
Operating cash flows from operating leases |  | 7,935 |  |  | 9,498 |  |  | 8,138 |
Operating cash flows from financing leases |  | 35 |  |  | 15 |  |  | 16 |
Financing cash flows from finance leases |  | 1,768 |  |  | 550 |  |  | 977 |
Non-cash items: |  |  |  |  |  |
Corporate actions related to fixed income securities, AFS 1 |  | 56,365 |  |  | 55,446 |  |  | 61,369 |
Corporate actions related to fixed income securities, held-to-maturity ("HTM")1 |  | — |  |  | 2,589 |  |  | — |
Corporate actions related to equity securities 1 |  | 30,666 |  |  | 10,890 |  |  | 14,250 |
Conversion of AFS fixed income securities to equity securities |  | 15,139 |  |  | — |  |  | — |
Assets acquired under finance lease arrangements |  | 6,709 |  |  | 324 |  |  | 824 |
Assets acquired under operating lease arrangements |  | 3,272 |  |  | 22,390 |  |  | 13,808 |
Non-cash purchase of property and equipment |  | 472 |  |  | 590 |  |  | 89 |
Schedule of Cash and Cash Equivalents |
($ in thousands) |  | December 31, 2021 |  | December 31, 2020
Cash |  | $ | 455 |  |  | 394 |
Restricted cash |  | 44,608 |  |  | 14,837 |
Total cash and restricted cash shown in the Statements of Cash Flows |  | $ | 45,063 |  |  | 15,231 |

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