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Adoption of Accounting Pronouncements (Income Statement Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Policy acquisition costs                 $ 579,977 $ 526,143 $ 466,404
Income from continuing operations, before federal income taxes                 143,802 37,635 11,400
Net income 25,335 32,653 27,122 21,308 1,308 18,274 288 18,093 106,418 37,963 22,033
Basic net income per share $ 0.45 $ 0.59 $ 0.49 $ 0.38 $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 1.91 $ 0.69 $ 0.41
Diluted net income per share $ 0.44 $ 0.57 $ 0.48 $ 0.38 $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 1.87 $ 0.68 $ 0.40
As Originally Reported [Member]
                      
Policy acquisition costs                     469,739
Income from continuing operations, before federal income taxes                     8,065
Net income                     $ 19,865
Basic net income per share                     $ 0.37
Diluted net income per share                     $ 0.36