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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |
Increase (decrease) in insurance business | $ (1,566) | $ 387,076
Partial offset, related to favorable development on reserves | $ 174,121 |
Catastrophe Losses [Member] |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |
Increase (decrease) in insurance business |  | $ 561,197

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- Definition Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense Related To Reserves + References No definition available. + Details
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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 (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=99382578&loc=d3e14764-158437 + Details
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- Details
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