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Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Effects of reinsurance on premiums and benefits        
Premiums written and contract deposits, gross amount $ 266,859 $ 266,430 $ 516,415 $ 518,081
Premiums written and contract deposits, ceded to other companies 7,505 8,228 14,768 16,214
Premiums written and contract deposits, assumed from other companies 935 1,122 1,395 1,559
Premiums written and contract deposits, net amount 260,289 259,324 503,042 503,426
Premiums and contract charges earned, gross amount 173,166 173,968 345,556 348,670
Premiums and contract charges earned, ceded to other companies 7,676 8,637 15,131 17,222
Premiums and contract charges earned, assumed from other companies 845 1,014 1,414 1,583
Premiums and contract charges earned, net amount 166,335 166,345 331,839 333,031
Benefits, claims and settlement expenses, gross amount 135,685 173,461 244,349 286,385
Benefits, claims and settlement expenses, ceded to other companies 5,392 10,359 6,780 13,200
Benefits, claims and settlement expenses, assumed from other companies 691 707 1,293 1,225
Benefits, claims and settlement expenses, net amount $ 130,984 $ 163,809 $ 238,862 $ 274,410