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Adoption of Accounting Pronouncements (Income Statement Statement) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Policy acquisition costs                 $ 526,143 $ 466,404 $ 455,852
Income from continuing operations, before federal income tax                 37,635 11,400 84,149
Net income 1,308 18,274 288 18,093 18,034 (17,968) 1,467 20,500 37,963 22,033 66,966
Basic net income per share $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 0.33 $ (0.33) $ 0.03 $ 0.38 $ 0.69 $ 0.41 $ 1.26
Diluted net income per share $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 0.33 $ (0.33) $ 0.03 $ 0.37 $ 0.68 $ 0.40 $ 1.23
As Originally Reported [Member]
                      
Policy acquisition costs                   469,739 458,045
Income from continuing operations, before federal income tax                   8,065 81,956
Net income                   $ 19,865 $ 65,541
Basic net income per share                   $ 0.37 $ 1.23
Diluted net income per share                   $ 0.36 $ 1.20