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Reserves For Claims (Summary Of Transactions In Reserves For Claims) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Reserves For Claims [Abstract]          
Balance, beginning of period     $ 37,996,000 $ 38,198,700 $ 38,198,700
Provision, charged to operations 361,107 1,229,961 1,992,466 1,951,587 3,342,427
Payments of claims, net of recoveries     (2,441,466) (2,545,287) (3,545,127)
Ending balance $ 37,547,000   $ 37,547,000   $ 37,996,000