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Basis of Presentation (Premium Receivable Expected Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Premiums Receivable, Net | $ 288,819 | $ 237,894 | $ 288,819 | $ 237,894 | $ 288,589 | $ 201,395 | $ 234,840 | $ 249,540
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Premium receivable, allowance for credit loss, beginning balance | 7,729 | 6,627 | 6,131 | 1,590 |  |  |  |
Initial allowance recognized in the period for NORCAL premium receivable |  |  | 2,137 |  |  |  |  |
Provision for expected credit losses | 48 | 123 | 505 | 616 |  |  |  |
Write offs charged against the allowance | (125) | (404) | (1,243) | (1,078) |  |  |  |
Recoveries of amounts previously written off | 24 | 270 | 146 | 328 |  |  |  |
Premium receivable, allowance for credit loss, ending balance | $ 7,676 | $ 6,616 | $ 7,676 | 6,616 |  |  |  |
Cumulative-effect adjustment |  |  |  |  |  |  |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Premium receivable, allowance for credit loss, beginning balance |  |  |  | $ 5,160 |  |  |  |

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- Definition Amount of expense (reversal of expense) for expected credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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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=120400017&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=124255953&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=124255953&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=123577603&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=123577603&loc=d3e5074-111524 + Details
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