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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 276,668 | $ 298,742 | $ 257,826
Future policy benefits, claims and claim expenses | 6,677,306 | 6,107,907 | 5,921,484
Unearned premiums | 279,163 | 276,225 | 260,539
Other policy claims and benefits payable | 647,283 | 767,988 | 724,261
Premium revenue/ premium earned | 897,954 | 817,333 | 794,703
Net investment income | 365,064 | 376,507 | 373,630
Benefits, claims and settlement expenses | 797,854 | 843,759 | 780,941
Amortization of deferred policy acquisition costs | 109,181 | 109,889 | 102,185
Other operating expenses | 287,001 | 218,414 | 199,737
Property and Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 28,616 | 30,033 | 29,191
Future policy benefits, claims and claim expenses | 386,976 | 367,180 | 319,182
Discount, if any, deducted in previous column | 0 | 0 | 0
Unearned premiums | 273,998 | 274,351 | 258,502
Other policy claims and benefits payable | 0 | 0 | 0
Premium revenue/ premium earned | 683,454 | 665,734 | 648,263
Net investment income | 41,740 | 40,104 | 36,178
Benefits, claims and settlement expenses | 475,563 | 547,659 | 496,289
Claims and claims adjustment expense incurred related to current year | 483,062 | 547,959 | 498,989
Claims and claims adjustment expense incurred related to prior years | (7,500) | (300) | (2,700)
Amortization of deferred policy acquisition costs | 79,453 | 79,073 | 76,967
Other operating expenses | 105,489 | 101,834 | 96,488
Paid claims and claim adjustment expenses | 486,547 | 531,977 | 481,074
Premiums written | 683,101 | 681,583 | 662,760
Supplemental |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 1,967 |  |
Future policy benefits, claims and claim expenses | 390,276 |  |
Unearned premiums | 3,218 |  |
Other policy claims and benefits payable | 0 |  |
Premium revenue/ premium earned | 65,815 |  |
Net investment income | 7,480 |  |
Benefits, claims and settlement expenses | 24,723 |  |
Amortization of deferred policy acquisition costs | 438 |  |
Other operating expenses | 26,476 |  |
Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 185,294 | 209,232 | 174,661
Future policy benefits, claims and claim expenses | 4,698,461 | 4,573,170 | 4,466,039
Unearned premiums | 734 | 704 | 705
Other policy claims and benefits payable | 643,826 | 764,607 | 720,926
Premium revenue/ premium earned | 29,083 | 31,269 | 28,003
Net investment income | 245,475 | 262,634 | 261,994
Benefits, claims and settlement expenses | 173,116 | 168,732 | 159,385
Amortization of deferred policy acquisition costs | 21,446 | 23,186 | 17,759
Other operating expenses | 90,782 | 57,269 | 49,733
Life |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 60,791 | 59,477 | 53,974
Future policy benefits, claims and claim expenses | 1,201,593 | 1,167,557 | 1,136,263
Unearned premiums | 1,213 | 1,170 | 1,332
Other policy claims and benefits payable | 3,457 | 3,381 | 3,335
Premium revenue/ premium earned | 119,602 | 120,330 | 118,437
Net investment income | 71,957 | 74,399 | 76,195
Benefits, claims and settlement expenses | 124,452 | 127,368 | 125,267
Amortization of deferred policy acquisition costs | 7,844 | 7,630 | 7,459
Other operating expenses | 37,820 | 36,314 | 36,550
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (1,588) | (630) | (737)
Other operating expenses | $ 26,434 | $ 22,997 | $ 16,966

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