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Segment Information (Details) (USD $)
In Thousands, 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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summarized financial information for these segments                              
Insurance premiums and contract charges earned                         $ 670,527 $ 667,120 $ 672,678
Net investment income                         306,003 288,311 272,054
Net income 31,826 32,266 13,103 26,671 32,913 23,637 (11,851) 25,807 14,592 19,886 23,381 22,272 103,866 70,506 80,131
Assets 8,167,726       7,435,169       6,945,662       8,167,726 7,435,169 6,945,662
Property and casualty [Member]
                              
Summarized financial information for these segments                              
Insurance premiums and contract charges earned                         546,339 547,540 555,825
Net investment income                         36,792 36,886 36,474
Net income                         37,043 5,844 26,996
Assets 1,016,368       957,266       943,406       1,016,368 957,266 943,406
Annuity [Member]
                              
Summarized financial information for these segments                              
Insurance premiums and contract charges earned                         21,794 18,883 17,346
Net investment income                         200,785 182,806 167,879
Net income                         40,527 30,906 30,747
Assets 5,380,780       4,926,204       4,530,927       5,380,780 4,926,204 4,530,927
Life [Member]
                              
Summarized financial information for these segments                              
Insurance premiums and contract charges earned                         102,394 100,697 99,507
Net investment income                         69,409 69,633 68,718
Net income                         21,912 19,435 20,323
Assets 1,663,696       1,459,919       1,369,475       1,663,696 1,459,919 1,369,475
Corporate and other [Member]
                              
Summarized financial information for these segments                              
Net investment income                         2 (3) 18
Net income                         4,384 14,321 2,065
Assets 131,449       115,367       130,191       131,449 115,367 130,191
Intersegment eliminations [Member]
                              
Summarized financial information for these segments                              
Net investment income                         (985) (1,011) (1,035)
Assets $ (24,567)       $ (23,587)       $ (28,337)       $ (24,567) $ (23,587) $ (28,337)