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Statements of Cash Flow (Tables) | 12 Months Ended
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Dec. 31, 2012
Supplemental Cash Flow Information [Abstract] |
Statements of Cash Flow |
($ in thousands) |  | 2012 |  | 2011 |  | 2010
Cash paid (received) during the period for: |  |  |  |  |  |  |  |  |
Interest |  | $ | 18,779 |  |  | 18,207 |  |  | 18,753 |
Federal income tax |  | 6,421 |  |  | (10,963 | ) |  | (2,781 | )

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