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Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Effects of reinsurance on premiums and benefits    
Premiums written and contract deposits, Gross Amount $ 252,065 $ 249,556
Premiums written and contract deposits, Ceded to Other Companies 7,403 7,263
Premiums written and contract deposits, Assumed from Other Companies 416 460
Premiums written and contract deposits, Net Amount 245,078 242,753
Premiums and contract charges earned, Gross Amount 176,308 172,390
Premiums and contract charges earned, Ceded to Other Companies 7,664 7,455
Premiums and contract charges earned, Assumed from Other Companies 514 569
Premiums and contract charges earned, Net Amount 169,158 165,504
Benefits, claims and settlement expenses, Gross Amount 114,178 108,664
Benefits, claims and settlement expenses, Ceded to Other Companies 1,931 1,388
Benefits, claims and settlement expenses, Assumed from Other Companies 452 602
Benefits, claims and settlement expenses, Net Amount $ 112,699 $ 107,878