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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Supplemental Cash Flow Information [Abstract] |  |
Interest | $ 11,504 | $ 11,074
Federal income tax | $ 6,300 | $ (6,460)

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