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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 298,742 | $ 257,826 | $ 267,580
Future policy benefits, claims and claim expenses | 6,107,907 | 5,921,484 | 5,777,857
Unearned premiums | 276,225 | 260,539 | 246,274
Other policy claims and benefits payable | 767,988 | 724,261 | 708,950
Premium revenue/ premium earned | 817,333 | 794,703 | 759,146
Net investment income | 376,507 | 373,630 | 361,186
Benefits, claims and settlement expenses | 843,759 | 780,941 | 733,026
Amortization of deferred policy acquisition costs | 109,889 | 102,185 | 96,732
Other operating expenses | 218,414 | 199,737 | 184,920
Property and Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 30,033 | 29,191 | 27,604
Future policy benefits, claims and claim expenses | 367,180 | 319,182 | 307,757
Discount, if any, deducted in previous column | 0 | 0 | 0
Unearned premiums | 274,351 | 258,502 | 244,005
Other policy claims and benefits payable | 0 | 0 | 0
Premium revenue/ premium earned | 665,734 | 648,263 | 620,514
Net investment income | 40,104 | 36,178 | 38,997
Benefits, claims and settlement expenses | 547,659 | 496,289 | 464,098
Claims and claims adjustment expense incurred related to current year | 547,959 | 498,989 | 471,098
Claims and claims adjustment expense incurred related to prior years | (300) | (2,700) | (7,000)
Amortization of deferred policy acquisition costs | 79,073 | 76,967 | 74,950
Other operating expenses | 101,834 | 96,488 | 90,802
Paid claims and claim adjustment expenses | 531,977 | 481,074 | 468,778
Premiums written | 681,583 | 662,760 | 634,319
Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 209,232 | 174,661 | 188,117
Future policy benefits, claims and claim expenses | 4,573,170 | 4,466,039 | 4,372,062
Unearned premiums | 704 | 705 | 671
Other policy claims and benefits payable | 764,607 | 720,926 | 705,603
Premium revenue/ premium earned | 31,269 | 28,003 | 24,937
Net investment income | 262,634 | 261,994 | 249,410
Benefits, claims and settlement expenses | 168,732 | 159,385 | 151,185
Amortization of deferred policy acquisition costs | 23,186 | 17,759 | 14,635
Other operating expenses | 57,269 | 49,733 | 40,289
Life |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 59,477 | 53,974 | 51,859
Future policy benefits, claims and claim expenses | 1,167,557 | 1,136,263 | 1,098,038
Unearned premiums | 1,170 | 1,332 | 1,598
Other policy claims and benefits payable | 3,381 | 3,335 | 3,347
Premium revenue/ premium earned | 120,330 | 118,437 | 113,695
Net investment income | 74,399 | 76,195 | 73,567
Benefits, claims and settlement expenses | 127,368 | 125,267 | 117,743
Amortization of deferred policy acquisition costs | 7,630 | 7,459 | 7,147
Other operating expenses | 36,314 | 36,550 | 36,806
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (630) | (737) | (788)
Other operating expenses | $ 22,997 | $ 16,966 | $ 17,023

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