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Schedule III and VI Supplementary Insurance Information Supplemental Information Concerning Property and Casualty Insurance Operations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplementary Insurance Information by Segment      
Deferred policy acquisition costs $ 196,885 $ 216,456 $ 222,177
Future policy benefits, claims and claims expenses 4,523,386 4,192,015 3,857,443
Discount, if any, deducted in previous column         
Unearned premiums 213,268 208,963 211,297
Other policy claims and benefits payable 103,227 114,530 129,247
Premium revenue/ premium earned 670,527 667,120 672,678
Net investment income 306,003 288,311 272,054
Benefits, claims and settlement expenses 611,815 657,344 621,556
Claims and claims adjustment expense incurred related to current year         
Claims and claims adjustment expense incurred related to prior years         
Amortization of deferred policy acquisition costs 79,519 83,398 77,347
Other operating expenses 170,307 162,642 165,643
Paid claims and claims adjustment expense         
Premiums written         
Property and casualty segment [Member]
      
Supplementary Insurance Information by Segment      
Deferred policy acquisition costs 24,650 22,906 21,927
Future policy benefits, claims and claims expenses 274,542 281,080 301,622
Discount, if any, deducted in previous column 0 0 0
Unearned premiums 209,431 204,996 206,586
Other policy claims and benefits payable         
Premium revenue/ premium earned 546,339 547,540 555,825
Net investment income 36,792 36,886 36,474
Benefits, claims and settlement expenses 389,430 442,517 418,254
Claims and claims adjustment expense incurred related to current year 406,605 452,827 438,784
Claims and claims adjustment expense incurred related to prior years (17,175) (10,310) (20,530)
Amortization of deferred policy acquisition costs 63,768 61,374 60,866
Other operating expenses 83,579 80,133 82,231
Paid claims and claims adjustment expense 398,210 462,298 414,063
Premiums written 550,774 545,950 557,074
Annuity [Member]
      
Supplementary Insurance Information by Segment      
Deferred policy acquisition costs 125,437 139,316 140,095
Future policy benefits, claims and claims expenses 3,264,128 2,951,004 2,621,524
Discount, if any, deducted in previous column         
Unearned premiums 526 34  
Other policy claims and benefits payable 99,603 110,734 125,432
Premium revenue/ premium earned 21,794 18,883 17,346
Net investment income 200,785 182,806 167,879
Benefits, claims and settlement expenses 124,693 115,468 107,529
Claims and claims adjustment expense incurred related to current year         
Claims and claims adjustment expense incurred related to prior years         
Amortization of deferred policy acquisition costs 6,868 12,334 7,026
Other operating expenses 34,148 31,802 30,553
Paid claims and claims adjustment expense         
Premiums written         
Life [Member]
      
Supplementary Insurance Information by Segment      
Deferred policy acquisition costs 46,798 54,234 60,155
Future policy benefits, claims and claims expenses 984,716 959,931 934,297
Discount, if any, deducted in previous column         
Unearned premiums 3,311 3,933 4,711
Other policy claims and benefits payable 3,624 3,796 3,815
Premium revenue/ premium earned 102,394 100,697 99,507
Net investment income 69,409 69,633 68,718
Benefits, claims and settlement expenses 97,692 99,359 95,773
Claims and claims adjustment expense incurred related to current year         
Claims and claims adjustment expense incurred related to prior years         
Amortization of deferred policy acquisition costs 8,883 9,690 9,455
Other operating expenses 33,589 33,135 34,352
Paid claims and claims adjustment expense         
Premiums written         
Other, including consolidating eliminations [Member]
      
Supplementary Insurance Information by Segment      
Future policy benefits, claims and claims expenses         
Discount, if any, deducted in previous column         
Premium revenue/ premium earned         
Net investment income (983) (1,014) (1,017)
Benefits, claims and settlement expenses         
Claims and claims adjustment expense incurred related to current year         
Claims and claims adjustment expense incurred related to prior years         
Amortization of deferred policy acquisition costs         
Other operating expenses 18,991 17,572 18,507
Paid claims and claims adjustment expense         
Premiums written