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Schedule III and VI Supplementary Insurance Information Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs $ 267,580 $ 253,176 $ 215,082
Future policy benefits, claims and claims expenses 5,777,857 5,450,562 5,128,055
Unearned premiums 246,274 232,841 223,413
Other policy claims and benefits payable 708,950 692,652 606,738
Premium revenue/ premium earned 759,146 731,880 715,760
Net investment income 361,186 332,600 329,815
Benefits, claims and settlement expenses 733,026 679,206 644,565
Amortization of deferred policy acquisition costs 96,732 98,919 93,817
Other operating expenses 184,920 172,871 176,190
Property and casualty [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 27,604 26,685 27,160
Future policy benefits, claims and claims expenses 307,757 301,569 311,097
Discount, if any, deducted in previous column 0 0 0
Unearned premiums 244,005 230,201 220,406
Other policy claims and benefits payable 0 0 0
Premium revenue/ premium earned 620,514 595,958 581,828
Net investment income 38,997 33,461 36,790
Benefits, claims and settlement expenses 464,098 420,311 399,512
Claims and claims adjustment expense incurred related to current year 471,099 432,811 416,512
Claims and claims adjustment expense incurred related to prior years [1] (7,000) (12,500) (17,000)
Amortization of deferred policy acquisition costs 74,950 73,173 71,327
Other operating expenses 90,802 84,785 88,305
Paid claims and claims adjustment expense 468,778 436,431 393,857
Premiums written 634,319 605,753 584,393
Retirement [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 188,117 178,300 143,522
Future policy benefits, claims and claims expenses 4,372,062 4,082,217 3,781,260
Unearned premiums 671 734 708
Other policy claims and benefits payable 705,603 689,116 603,267
Premium revenue/ premium earned 24,937 25,378 25,540
Net investment income 249,410 228,378 222,071
Benefits, claims and settlement expenses 151,185 141,893 134,760
Amortization of deferred policy acquisition costs 14,635 18,155 14,781
Other operating expenses 40,289 32,555 33,210
Life [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 51,859 48,191 44,400
Future policy benefits, claims and claims expenses 1,098,038 1,066,776 1,035,698
Unearned premiums 1,598 1,906 2,299
Other policy claims and benefits payable 3,347 3,536 3,471
Premium revenue/ premium earned 113,695 110,544 108,392
Net investment income 73,567 71,614 71,865
Benefits, claims and settlement expenses 117,743 117,002 110,293
Amortization of deferred policy acquisition costs 7,147 7,591 7,709
Other operating expenses 36,806 35,470 36,421
Other, including consolidating eliminations [Member] | Consolidation, Eliminations [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Net investment income (788) (853) (911)
Other operating expenses $ 17,023 $ 20,061 $ 18,254
[1] Shows the amounts by which the Company decreased its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs. Also refer to the paragraphs below for additional information regarding the reserve development recorded in 2016, 2015 and 2014.