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Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | $ 130,850,000 | $ 130,850,000 | $ 57,499,000
Other Investments | 3,624,000 | 3,624,000 | 4,973,000
Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 6,681,035,000 | 6,681,035,000 | 6,786,469,000
Derivative, Fair Value, Net | 5,905,000 | 5,905,000 | 5,513,000
Assets, Fair Value Disclosure | 6,817,790,000 | 6,817,790,000 | 6,849,481,000
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 775,124,000 | 775,124,000 | 551,695,000
Derivative, Fair Value, Net | 0 | 0 | 0
Assets, Fair Value Disclosure | 810,656,000 | 810,656,000 | 577,870,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,902,911,000 | 5,902,911,000 | 6,231,774,000
Derivative, Fair Value, Net | 0 | 0 | 0
Assets, Fair Value Disclosure | 5,998,229,000 | 5,998,229,000 | 6,263,098,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 3,000,000 | 3,000,000 | 3,000,000
Derivative, Fair Value, Net | 5,905,000 | 5,905,000 | 5,513,000
Assets, Fair Value Disclosure | 8,905,000 | 8,905,000 | 8,513,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 | 0 | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 5,550,000 | 5,550,000 | 4,876,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 95,318,000 | 95,318,000 | 31,324,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 29,982,000 | 29,982,000 | 21,299,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 5,550,000 | 5,550,000 | 4,876,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 29,982,000 | 29,982,000 | 21,299,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 95,318,000 | 95,318,000 | 31,324,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 0 | 0 | 0
Fixed-maturities available for sale | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 213,954,000 | 213,954,000 | 176,033,000
Fixed-maturities available for sale | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 141,431,000 | 141,431,000 | 149,258,000
Fixed-maturities available for sale | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 2,909,453,000 | 2,909,453,000 | 2,832,350,000
Fixed-maturities available for sale | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 701,664,000 | 701,664,000 | 799,814,000
Fixed-maturities available for sale | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 685,595,000 | 685,595,000 | 645,071,000
Fixed-maturities available for sale | CLO |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 519,909,000 | 519,909,000 | 569,173,000
Fixed-maturities available for sale | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 225,012,000 | 225,012,000 | 249,988,000
Fixed-maturities available for sale | Foreign government and agency securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,105,000 | 5,105,000 | 5,100,000
Fixed-maturities available for sale | Mortgage insurance-linked notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 45,384,000 | 45,384,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,572,813,000 | 5,572,813,000 | 5,723,340,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 208,663,000 | 208,663,000 | 169,223,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 157,944,000 | 157,944,000 | 165,271,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 2,970,142,000 | 2,970,142,000 | 3,047,189,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 719,840,000 | 719,840,000 | 833,939,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 714,671,000 | 714,671,000 | 681,265,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 521,153,000 | 521,153,000 | 568,558,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 226,968,000 | 226,968,000 | 252,457,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,399,000 | 5,399,000 | 5,438,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 48,033,000 | 48,033,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 178,709,000 | 178,709,000 | 140,034,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 178,709,000 | 178,709,000 | 140,034,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CLO |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,394,104,000 | 5,394,104,000 | 5,583,306,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 29,954,000 | 29,954,000 | 29,189,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 157,944,000 | 157,944,000 | 165,271,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 2,970,142,000 | 2,970,142,000 | 3,047,189,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 719,840,000 | 719,840,000 | 833,939,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 714,671,000 | 714,671,000 | 681,265,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CLO |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 521,153,000 | 521,153,000 | 568,558,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 226,968,000 | 226,968,000 | 252,457,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,399,000 | 5,399,000 | 5,438,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 48,033,000 | 48,033,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CLO |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Trading Securities | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 267,980,000 | 267,980,000 | 290,885,000
Trading Securities | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 101,454,000 | 101,454,000 | 120,449,000
Trading Securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 121,377,000 | 121,377,000 | 123,142,000
Trading Securities | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 11,134,000 | 11,134,000 | 13,000,000
Trading Securities | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 34,015,000 | 34,015,000 | 34,294,000
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 267,980,000 | 267,980,000 | 290,885,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 101,454,000 | 101,454,000 | 120,449,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 121,377,000 | 121,377,000 | 123,142,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 11,134,000 | 11,134,000 | 13,000,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 34,015,000 | 34,015,000 | 34,294,000
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Equity securities | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 175,147,000 | 175,147,000 | 151,240,000
Equity securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 167,610,000 | 167,610,000 | 142,761,000
Equity securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 7,537,000 | 7,537,000 | 8,479,000
Equity securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 662,095,000 | 662,095,000 | 618,004,000
Short-term investments | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 21,997,000 | 21,997,000 |
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 15,940,000 | 15,940,000 | 21,819,000
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 406,808,000 | 406,808,000 | 268,900,000
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 19,931,000 | 19,931,000 | 30,495,000
Short-term investments | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 4,780,000 | 4,780,000 |
Short-term investments | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 431,000 | 431,000 | 219,000
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 192,208,000 | 192,208,000 | 296,571,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 428,805,000 | 428,805,000 | 268,900,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 21,997,000 | 21,997,000 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Money market instruments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 406,808,000 | 406,808,000 | 268,900,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 233,290,000 | 233,290,000 | 349,104,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 15,940,000 | 15,940,000 | 21,819,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Money market instruments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 19,931,000 | 19,931,000 | 30,495,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 4,780,000 | 4,780,000 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 431,000 | 431,000 | 219,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 192,208,000 | 192,208,000 | 296,571,000
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Money market instruments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Other investments | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 3,000,000 | 3,000,000 | 3,000,000
Other investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Other investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 0 | 0 | 0
Other investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 3,000,000 | 3,000,000 | 3,000,000
Partnership investment | Investments Measured at NAV |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Other Investments | $ 600,000 | $ 600,000 | $ 2,000,000.0

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