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Significant Accounting Policies (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings | $ (587,867,000) |  | $ (573,619,000)
Accrued interest receivable on available-for-sale securities | 5,100,000 |  |
Premium receivable, allowance for credit loss | 800,000 |  | 700,000
Reinsurance, allowance for credit loss | $ 0 |  | $ 0
Cumulative Effect, Period Of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings |  | $ 600,000 |
Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Short-term investment maturity period | 3 months |  |

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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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