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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
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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

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