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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | $ 257,826 | $ 267,580 | $ 253,176
Future policy benefits, claims and claim expenses | 5,921,484 | 5,777,857 | 5,450,562
Unearned premiums | 260,539 | 246,274 | 232,841
Other policy claims and benefits payable | 724,261 | 708,950 | 692,652
Premium revenue/ premium earned | 794,703 | 759,146 | 731,880
Net investment income | 373,630 | 361,186 | 332,600
Benefits, claims and settlement expenses | 780,941 | 733,026 | 679,206
Amortization of deferred policy acquisition costs | 102,185 | 96,732 | 98,919
Other operating expenses | 199,737 | 184,920 | 172,871
Property and Casualty |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 29,191 | 27,604 | 26,685
Future policy benefits, claims and claim expenses | 319,182 | 307,757 | 301,569
Discount, if any, deducted in previous column | 0 | 0 | 0
Unearned premiums | 258,502 | 244,005 | 230,201
Other policy claims and benefits payable | 0 | 0 | 0
Premium revenue/ premium earned | 648,263 | 620,514 | 595,958
Net investment income | 36,178 | 38,997 | 33,461
Benefits, claims and settlement expenses | 496,289 | 464,098 | 420,311
Claims and claims adjustment expense incurred related to current year | 498,989 | 471,098 | 432,811
Claims and claims adjustment expense incurred related to prior years | (2,700) | (7,000) | (12,500)
Amortization of deferred policy acquisition costs | 76,967 | 74,950 | 73,173
Other operating expenses | 96,488 | 90,802 | 84,785
Paid claims and claim adjustment expenses | 481,074 | 468,778 | 436,431
Premiums written | 662,760 | 634,319 | 605,753
Retirement |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 174,661 | 188,117 | 178,300
Future policy benefits, claims and claim expenses | 4,466,039 | 4,372,062 | 4,082,217
Unearned premiums | 705 | 671 | 734
Other policy claims and benefits payable | 720,926 | 705,603 | 689,116
Premium revenue/ premium earned | 28,003 | 24,937 | 25,378
Net investment income | 261,994 | 249,410 | 228,378
Benefits, claims and settlement expenses | 159,385 | 151,185 | 141,893
Amortization of deferred policy acquisition costs | 17,759 | 14,635 | 18,155
Other operating expenses | 49,733 | 40,289 | 32,555
Life |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 53,974 | 51,859 | 48,191
Future policy benefits, claims and claim expenses | 1,136,263 | 1,098,038 | 1,066,776
Unearned premiums | 1,332 | 1,598 | 1,906
Other policy claims and benefits payable | 3,335 | 3,347 | 3,536
Premium revenue/ premium earned | 118,437 | 113,695 | 110,544
Net investment income | 76,195 | 73,567 | 71,614
Benefits, claims and settlement expenses | 125,267 | 117,743 | 117,002
Amortization of deferred policy acquisition costs | 7,459 | 7,147 | 7,591
Other operating expenses | 36,550 | 36,806 | 35,470
Other, including consolidating eliminations | Eliminations |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Net investment income |  | (788) |
Other operating expenses | $ 16,966 | $ 17,023 | $ 20,061

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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 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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