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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 229,828 | $ 276,668 | $ 298,742
Future policy benefits, claims and claim expenses | 6,884,077 | 6,677,306 | 6,107,907
Unearned premiums | 264,489 | 279,163 | 276,225
Other policy claims and benefits payable | 751,296 | 647,283 | 767,988
Premium revenue/ premium earned | 930,697 | 897,954 | 817,333
Net investment income | 357,596 | 365,064 | 376,507
Benefits, claims and settlement expenses | 773,526 | 797,854 | 843,759
Amortization of deferred policy acquisition costs | 99,909 | 109,181 | 109,889
Other operating expenses | 277,423 | 287,001 | 218,414
Property and Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 26,153 | 28,616 | 30,033
Future policy benefits, claims and claim expenses | 372,154 | 386,976 | 367,180
Discount, if any, deducted in previous column | 0 | 0 | 0
Unearned premiums | 259,356 | 273,998 | 274,351
Other policy claims and benefits payable | 0 | 0 | 0
Premium revenue/ premium earned | 650,168 | 683,454 | 665,734
Net investment income | 42,556 | 41,740 | 40,104
Benefits, claims and settlement expenses | 430,991 | 475,563 | 547,659
Claims and claims adjustment expense incurred related to current year | 441,191 | 483,062 | 547,959
Claims and claims adjustment expense incurred related to prior years | (10,200) | (7,500) | (300)
Amortization of deferred policy acquisition costs | 74,452 | 79,453 | 79,073
Other operating expenses | 97,716 | 105,489 | 101,834
Paid claims and claim adjustment expenses | 438,189 | 486,547 | 531,977
Premiums written | 635,525 | 683,101 | 681,583
Supplemental |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 4,270 | 1,967 |
Future policy benefits, claims and claim expenses | 392,362 | 390,276 |
Unearned premiums | 3,084 | 3,218 |
Other policy claims and benefits payable | 41,514 | 0 |
Premium revenue/ premium earned | 130,694 | 65,815 |
Net investment income | 17,818 | 7,480 |
Benefits, claims and settlement expenses | 43,166 | 24,723 |
Amortization of deferred policy acquisition costs | 1,287 | 438 |
Other operating expenses | 51,686 | 26,476 |
Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 137,735 | 185,294 | 209,232
Future policy benefits, claims and claim expenses | 4,874,167 | 4,698,461 | 4,573,170
Unearned premiums | 716 | 734 | 704
Other policy claims and benefits payable | 706,297 | 643,826 | 764,607
Premium revenue/ premium earned | 29,649 | 29,083 | 31,269
Net investment income | 229,853 | 245,475 | 262,634
Benefits, claims and settlement expenses | 164,807 | 173,116 | 168,732
Amortization of deferred policy acquisition costs | 16,718 | 21,446 | 23,186
Other operating expenses | 72,093 | 90,782 | 57,269
Life |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 61,670 | 60,791 | 59,477
Future policy benefits, claims and claim expenses | 1,245,394 | 1,201,593 | 1,167,557
Unearned premiums | 1,333 | 1,213 | 1,170
Other policy claims and benefits payable | 3,485 | 3,457 | 3,381
Premium revenue/ premium earned | 120,186 | 119,602 | 120,330
Net investment income | 69,799 | 71,957 | 74,399
Benefits, claims and settlement expenses | 134,562 | 124,452 | 127,368
Amortization of deferred policy acquisition costs | 7,452 | 7,844 | 7,630
Other operating expenses | 35,292 | 37,820 | 36,314
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (2,430) | (1,588) | (630)
Other operating expenses | $ 20,636 | $ 26,434 | $ 22,997

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