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Property and Casualty Unpaid Claims and Claim Expenses - Summary of Reinsurance Reserve Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Gross reserves, beginning of year | $ 396,714 |  |
Less: reinsurance recoverables | 99,510 |  |
Claims and claim expense payments for claims occurring during: |  |  |
Benefits, claims and settlement expenses | 585,068 | $ 637,560 | $ 582,306
Plus: reinsurance recoverables | 129,213 | 99,510 |
Gross reserves, end of year | 442,854 | 396,714 |
Property and Casualty segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross reserves, beginning of year | 367,180 | 319,182 | 307,757
Less: reinsurance recoverables | 89,725 | 57,409 | 61,199
Net reserves, beginning of year | 277,455 | 261,773 | 246,558
Incurred claims and claim expenses: |  |  |
Claims occurring in the current year | 483,062 | 547,959 | 498,989
Decrease in estimated reserves for claims occurring in prior years | (7,500) | (300) | (2,700)
Total claims and claim expenses incurred | 475,562 | 547,659 | 496,289
Claims and claim expense payments for claims occurring during: |  |  |
Current year | 329,475 | 369,194 | 333,385
Prior years | 157,072 | 162,783 | 147,689
Total claims and claim expense payments | 486,547 | 531,977 | 481,074
Net reserves, end of year | 266,470 | 277,455 | 261,773
Liability for unpaid claims and claims adjustment expense, net | 266,470 | 261,773 | 261,773
Plus: reinsurance recoverables | 120,506 | 89,725 | 57,409
Gross reserves, end of year | 386,976 | 367,180 | 319,182
Life and Annuity segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net reserves, beginning of year | 29,500 | 28,600 |
Claims and claim expense payments for claims occurring during: |  |  |
Net reserves, end of year | 55,900 | 29,500 | 28,600
Liability for unpaid claims and claims adjustment expense, net | 29,500 | 28,600 | 28,600
Benefits, claims and settlement expenses | $ 109,500 | $ 89,900 | $ 86,000

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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