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Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | $ 63,927,000 |  | $ 57,399,000
Investment related gains (losses), net | $ (582,000) | $ 292,000 |
Limited Partnership Funds - Middle Market |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated Maturity Timeframe of Other Long-Term Investments | 9 years |  | 10 years
Limited Partnership Funds - Global |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated Maturity Timeframe of Other Long-Term Investments | 0 years |  | 0 years
Limited Partnership Funds - Late-Stage Growth |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated Maturity Timeframe of Other Long-Term Investments | 6 years |  | 6 years
Limited Partnership Funds - Infrastructure |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated Maturity Timeframe of Other Long-Term Investments | 11 years |  | 12 years
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 Measured at Net Asset Value Per Share | Limited Partnership Funds - Middle Market |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 27,336,000 |  | 21,947,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Middle Market | Unfunded Loan Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 13,593,000 |  | 18,712,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Global |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 9,890,000 |  | 10,607,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Global | Unfunded Loan Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 0 |  | 0
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Late-Stage Growth |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 21,564,000 |  | 20,468,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Late-Stage Growth | Unfunded Loan Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 7,256,000 |  | 4,459,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Infrastructure |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 3,774,000 |  | 3,016,000
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds - Infrastructure | Unfunded Loan Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | 15,970,000 |  | 16,653,000
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
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds [Member] | Unfunded Loan Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other long-term investments | $ 36,819,000 |  | $ 39,824,000

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