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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Accounting Policies [Abstract] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 7 years |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Premium Receivable, Allowance for Credit Loss |  | $ 32 | $ 140 |  | $ 165
Reinsurance Recoverable, Allowance for Credit Loss |  | 563 | 386 | $ 256 |
Financing Receivable, Allowance for Credit Loss |  | 0 | 20 | 141 |
Total Credit Loss Allowances |  | 595 | 546 | 562 |
Charged to Costs and Expenses |  | (190) | (311) |  |
Reinsurance Recoverable, Credit Loss Expense (Reversal) |  | 177 | 130 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 0 | 0 |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (20) | (121) |  |
Total Credit Loss Allowance Writeoffs |  | 82 | 286 |  |
Change in Credit Loss Allowance |  | (33) | (302) |  |
Premium Receivable, Allowance for Credit Loss, Writeoff |  | 82 | 286 |  |
Reinsurance recoverable, allowance for credit loss, writeoff |  | 0 | 0 |  |
Cash, Uninsured Amount |  | 254,989 | 320,514 |  |
Marketing and Advertising Expense |  | $ 910 | 1,212 | $ 1,426 |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) | $ 5,263 |  |  |  |
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit) |  |  | $ 12,566 |  |

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