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Reinsurance and Catastrophes (Details 1) (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
Effects of reinsurance on premiums and benefits                              
Premiums written and contract deposits, Gross Amount                         $ 1,093,937 $ 1,106,012 $ 1,082,100
Premiums written and contract deposits, Ceded to Other Companies                         29,691 31,271 35,035
Premiums written and contract deposits, Assumed from Other Companies                         3,481 3,708 4,896
Premiums written and contract deposits, Net Amount 279,479 285,206 260,289 242,753 276,113 298,910 259,324 244,102 269,173 289,316 254,766 238,706 1,067,727 1,078,449 1,051,961
Premiums and contract charges earned, Gross Amount                         696,721 695,264 702,930
Premiums and contract charges earned, Ceded to Other Companies                         29,634 31,940 35,057
Premiums and contract charges earned, Assumed from Other Companies                         3,440 3,796 4,805
Premiums and contract charges earned, Net Amount                         670,527 667,120 672,678
Benefits, claims and settlement expenses, Gross Amount                         457,332 519,935 479,716
Benefits, claims and settlement expenses, Ceded to Other Companies                         12,177 20,767 8,934
Benefits, claims and settlement expenses, Assumed from Other Companies                         3,095 3,266 4,051
Benefits, claims and settlement expenses, Net Amount                         $ 448,250 $ 502,434 $ 474,833