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Statements of Cash Flow (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures |
($ in thousands) |  | 2017 |  | 2016 |  | 2015
Cash paid during the period for: |  |  |  |  |  |  |  |  |
Interest |  | $ | 23,905 |  |  | 22,098 |  |  | 21,892 |
Federal income tax |  | 62,000 |  |  | 46,405 |  |  | 39,500 |
Non-cash items: |  |  |  |  |  |
Exchange of fixed income securities, AFS |  | 22,511 |  |  | 23,579 |  |  | 36,792 |
Exchange of fixed income securities, HTM |  | — |  |  | — |  |  | 15,257 |
Corporate actions related to equity securities, AFS 1 |  | 4,725 |  |  | 3,263 |  |  | 4,239 |
Assets acquired under capital lease arrangements |  | 278 |  |  | 3,151 |  |  | 6,760 |
Non-cash purchase of property and equipment |  | — |  |  | 78 |  |  | — |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- References No definition available. + Details
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