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Fair Value Measurements Financial Instruments Carried at Fair Value (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | $ 1,355,410,000 |  | $ 1,470,617,000
Equity security | 13,902,000 |  | 14,844,000
Other long-term investments | 63,927,000 |  | 57,399,000
Assets, Fair Value Disclosure | $ 1,431,876,000 |  | 1,541,499,000
Percent of Level 2 Debt Maturity to Total Reported Fair Value of Financial Assets | 93.90% |  |
Debt Instrument, Change in Valuation Technique [true false] | false |  |
Number of Third Party Pricing Changes | 0 |  |
Investment related gains (losses), net | $ (582,000) | $ 292,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | $ 0 |
Limited Partnership Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 0 |  | 0
Investment related gains (losses), net | (800,000) |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Disclosure | 24,122,000 |  | 25,506,000
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Disclosure | 1,345,190,000 |  | 1,459,955,000
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Disclosure | 0 |  | 0
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 62,564,000 |  | 56,038,000
US Treasury and Government [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 14,319,000 |  | 15,070,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 10,170,000 |  | 10,611,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 4,149,000 |  | 4,459,000
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 358,395,000 |  | 383,958,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 358,395,000 |  | 383,958,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 814,130,000 |  | 893,008,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 50,000 |  | 51,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 814,080,000 |  | 892,957,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 123,162,000 |  | 133,795,000
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 123,162,000 |  | 133,795,000
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Asset-backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 45,297,000 |  | 44,676,000
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 45,297,000 |  | 44,676,000
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Foreign Government, Non-US [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 107,000 |  | 110,000
Foreign Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Foreign Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 107,000 |  | 110,000
Foreign Government, Non-US [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 1,355,410,000 |  | 1,470,617,000
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 10,220,000 |  | 10,662,000
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 1,345,190,000 |  | 1,459,955,000
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Stock Mutual Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 3,476,000 |  | 3,571,000
Stock Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 3,476,000 |  | 3,571,000
Stock Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Stock Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Bond Mutual Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 4,880,000 |  | 5,060,000
Bond Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 4,880,000 |  | 5,060,000
Bond Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Bond Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Common stock [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 957,000 |  | 990,000
Common stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 957,000 |  | 990,000
Common stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Common stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Non-redeemable Preferred Stock [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 10,000 |  | 161,000
Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 10,000 |  | 161,000
Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Nonredeemable Preferred Stock Fund Member [Domain] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 4,579,000 |  | 5,062,000
Nonredeemable Preferred Stock Fund Member [Domain] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 4,579,000 |  | 5,062,000
Nonredeemable Preferred Stock Fund Member [Domain] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Nonredeemable Preferred Stock Fund Member [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 13,902,000 |  | 14,844,000
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 13,902,000 |  | 14,844,000
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity security | 0 |  | 0
Other Long-term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 62,564,000 |  | 56,038,000
Other Long-term Investments | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 0 |  | 0
Other Long-term Investments | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 0 |  | 0
Other Long-term Investments | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | $ 0 |  | $ 0

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