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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Gross reserves, beginning of year | $ 347,749 |  |
Less: reinsurance recoverables | 68,446 |  |
Claims and claim expense payments for claims occurring during: |  |  |
Plus: reinsurance recoverables | 99,510 | $ 68,446 |
Gross reserves, end of year | 396,714 | 347,749 |
Benefits, claims and settlement expenses, Net Amount | 637,560 | 582,306 | $ 541,004
Property and Casualty segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross reserves, beginning of year | 319,182 | 307,757 | 301,569
Less: reinsurance recoverables | 57,409 | 61,199 | 50,332
Net reserves, beginning of year | 261,773 | 246,558 | 251,237
Incurred claims and claim expenses: |  |  |
Claims occurring in the current year | 547,959 | 498,989 | 471,099
Decrease in estimated reserves for claims occurring in prior years | (300) | (2,700) | (7,000)
Total claims and claim expenses incurred | 547,659 | 496,289 | 464,099
Claims and claim expense payments for claims occurring during: |  |  |
Current year | 369,194 | 333,385 | 323,025
Prior years | 162,783 | 147,689 | 145,753
Total claims and claim expense payments | 531,977 | 481,074 | 468,778
Net reserves, end of year | 277,455 | 261,773 | 246,558
Plus: reinsurance recoverables | 89,725 | 57,409 | 61,199
Gross reserves, end of year | 367,180 | 319,182 | 307,757
Life and Annuity segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net reserves, beginning of year | 28,567 | 22,131 |
Claims and claim expense payments for claims occurring during: |  |  |
Net reserves, end of year | 29,534 | 28,567 | 22,131
Benefits, claims and settlement expenses, Net Amount | $ 89,901 | $ 86,017 | $ 76,905

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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=99382578&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=99382578&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=99382578&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=99382578&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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=99382578&loc=d3e14764-158437 Reference 3: 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=99382578&loc=d3e14764-158437 + Details
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