Variable Interest Entity (Details) (Indemnity)
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12 Months Ended | |
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Dec. 31, 2012
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Mar. 31, 2011
Erie Family Life Insurance Company (EFL)
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Variable Interest Entity disclosures | ||
Indemnity's maximum management fee rate as a percent of premiums written and assumed by the Exchange | 25.00% | |
Indemnity's ownership interest in EFL sold to the Exchange (as a percent) | 21.60% |