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Property and Casualty Unpaid Claims and Claim Expenses - Summary of Reinsurance Reserve Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Beginning Gross reserves |  |  |  | $ 347,749 |
Claims and claim expense payments for claims occurring during: |  |  |  |  |
Ending Gross reserves | $ 379,833 |  |  | 379,833 |
Benefits, claims and settlement expenses | 168,278 | $ 165,879 |  | 311,840 | $ 309,975
Property and Casualty |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Beginning Gross reserves | 331,255 | 316,173 | $ 307,757 | 319,182 | 307,757
Less: reinsurance recoverables | 62,917 | 61,804 | 61,199 | 57,409 | 61,199
Net reserves, beginning of year | 268,338 | 254,369 | 246,558 | 261,773 | 246,558
Incurred claims and claim expenses: |  |  |  |  |
Claims occurring in the current period | 147,005 | 148,348 |  | 267,993 | 271,552
Decrease in estimated reserves for claims occurring in prior years | 0 | (600) |  | (300) | (1,600)
Total claims and claim expenses incurred | 147,005 | 147,748 |  | 267,693 | 269,952
Claims and claim expense payments for claims occurring during: |  |  |  |  |
Current period | 80,403 | 95,645 |  | 127,451 | 148,025
Prior periods | 45,006 | 35,538 |  | 112,081 | 97,551
Total claims and claim expense payments | 125,409 | 131,183 |  | 239,532 | 245,576
Net reserves, end of year | 289,934 | 270,934 | 254,369 | 289,934 | 270,934
Plus: reinsurance recoverables | 62,883 | 58,897 | 61,804 | 62,883 | 58,897
Ending Gross reserves | 352,817 | 329,831 | 316,173 | 352,817 | 329,831
Life and Annuity segments |  |  |  |  |
Claims and claim expense payments for claims occurring during: |  |  |  |  |
Net reserves, end of year | 27,016 | $ 22,682 |  | 27,016 | 22,682
Benefits, claims and settlement expenses | $ 21,273 |  | $ 18,131 | $ 44,147 | $ 40,023

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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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