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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gross reserve for loss and loss expense, at beginning of year |  | $ 4,067,163 | $ 3,893,868 | $ 3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year |  | 544,162 | 537,388 | 585,855
Net reserves for loss and loss expense, at beginning of year |  | 3,523,001 | 3,356,480 | 3,185,385
Incurred loss and loss expense for claims occurring in the current year |  | 1,708,755 | 1,601,780 | 1,527,997
Prior Year Claims and Claims Adjustment Expense |  | (72,932) | (50,289) | (29,863)
Total incurred loss and loss expense |  | 1,635,823 | 1,551,491 | 1,498,134
Paid loss and loss expense for claims occurring in current year |  | 642,586 | 579,527 | 573,718
Paid loss and loss expense for claims occurring in prior years |  | 807,248 | 805,443 | 753,321
Total paid loss and loss expense |  | 1,449,834 | 1,384,970 | 1,327,039
Net reserves for loss and loss expense, at end of year |  | 3,706,086 | 3,523,001 | 3,356,480
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year |  | 554,269 | 544,162 | 537,388
Gross reserve for loss and loss expense, at end of year |  | 4,260,355 | 4,067,163 | 3,893,868
Increase of net loss and loss expense reserves |  | 183,100 | 166,500 | 171,100
Anticipated recoveries for salvage and subrogation claims |  | 80,900 | 76,700 | $ 67,700
Accounting Standards Update 2016-13 [Member] |  |  |  |
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year | [1] | 547,066 |  |
Net reserves for loss and loss expense, at beginning of year |  | $ 3,520,097 |  |
Net reserves for loss and loss expense, at end of year |  |  | 3,520,097 |
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year | [1] |  | $ 547,066 |
[1] | Includes an adjustment of $2.9 million related to our adoption of ASU 2016-13. Refer to Note 3. "Adoption of Accounting Pronouncements" for additionalinformation.

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- Definition Amount of increase (decrease) in liability 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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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 expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + 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 (b) -URI http://asc.fasb.org/extlink&oid=116884095&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=120400017&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=116884095&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=116884095&loc=d3e14764-158437 + Details
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- Definition The estimated amount as of the balance sheet date to be received by an insurer from the sale of property (usually damaged) on which the insurer has paid a total claim to the insured and has obtained title to the property and the right of an insurer to pursue any course of recovery of damages, in its name or in the name of the policyholder, against a third party who is liable for costs relating to an insured event that have been paid by the insurer. Estimated salvage and subrogation is generally deducted from the liability for unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13783-158432 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13779-158432 + Details
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