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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
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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.

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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition The amount of discount that may be deducted from the reserve for unpaid claims and claims adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Payments of claims and claims adjustment expenses during the period of a property-casualty insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount of net investment income earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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