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Statements of Cash Flow (Tables) | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures |
($ in thousands) |  | 2018 |  | 2017 |  | 2016
Cash paid during the period for: |  |  |  |  |  |  |  |  |
Interest |  | $ | 23,992 |  |  | 23,905 |  |  | 22,098 |
Federal income tax |  | 29,193 |  |  | 62,000 |  |  | 46,405 |
Non-cash items: |  |  |  |  |  |
Corporate actions related to fixed income securities, AFS 1 |  | 52,277 |  |  | 22,511 |  |  | 23,579 |
Corporate actions related to equity securities 1 |  | 944 |  |  | 4,725 |  |  | 3,263 |
Assets acquired under capital lease arrangements |  | 4,119 |  |  | 278 |  |  | 3,151 |
Non-cash purchase of property and equipment |  | 291 |  |  | — |  |  | 78 |
Schedule of Cash and Cash Equivalents |
($ in thousands) |  | December 31, 2018 |  | December 31, 2017
Cash |  | $ | 505 |  |  | 534 |
Restricted cash |  | 16,414 |  |  | 44,176 |
Total cash and restricted cash shown in the Statements of Cash Flows |  | $ | 16,919 |  |  | 44,710 |

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