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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Interest | $ 10,295,000 | $ 9,389,000
Federal income tax | 11,000,000 | 6,300,000
National Flood Insurance Program [Member] |  |
Restricted Cash | $ 13,600,000 |

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