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Income Taxes (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 05, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gain on bargain purchase |  | $ 0 | $ 0 | $ 74,408 | $ 0 |
Goodwill impairment |  | 0 | 161,115 | 0 | $ 161,115 | $ 161,115
Non-deductible goodwill impairment loss |  |  | 149,600 |  |  |
Deductible goodwill impairment losses |  |  | $ 11,500 |  |  |
Income taxes receivable |  | 6,700 |  | 6,700 |  | 18,900
Unrecognized tax benefits |  | 5,800 |  | 5,800 |  | 5,700
Accrued liability for interest related to unrecognized tax benefits |  | 600 |  | 600 |  | $ 500
Tax Year 2020 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  | 33,300 |  | 33,300 |  |
Income tax refund, CARES Act |  | 11,700 |  | 11,700 |  |
Tax Year 2019 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  | 25,600 |  | 25,600 |  |
Income tax refund, CARES Act |  | 9,000 |  | 9,000 |  |
NORCAL Group |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gain on bargain purchase | $ 74,408 |  |  |  |  |
Deferred tax asset, net | $ 46,759 |  |  |  |  |
Operating loss carryforwards |  | $ 68,000 |  | $ 68,000 |  |

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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6571-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6527-128477 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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