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Adoption of Accounting Ponoucements (Cash Flow Information) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
(Increase) decrease in deferred policy acquisition costs | $ (8,570) | $ 996
Decrease in net federal income taxes | 4,227 | 5,663
As Previously Reported [Member] |  |
(Increase) decrease in deferred policy acquisition costs |  | (618)
Decrease in net federal income taxes |  | 6,228
Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member] |  |
(Increase) decrease in deferred policy acquisition costs |  | 1,614
Decrease in net federal income taxes |  | $ (565)

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- Definition Total net Increase or Decrease in changes to deferred policy acquisition costs due to one or more transactions, including amortization of costs and modifications or internal replacements of existing insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6967983&loc=d3e11264-158415 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration