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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |
Current year losses | $ 1,713,253 | $ 1,433,440
Increase (decrease) in insurance business | (1,834) | $ (2,600)
Catastrophe Losses [Member] |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |
Current year losses | $ 240,000 |

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- Definition Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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