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Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | $ 135,058,000 | $ 135,058,000 | $ 57,499,000
Other Investments | 3,899,000 | 3,899,000 | 4,973,000
Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 6,657,588,000 | 6,657,588,000 | 6,786,469,000
Derivative, Fair Value, Net | 5,499,000 | 5,499,000 | 5,513,000
Assets, Fair Value Disclosure | 6,798,145,000 | 6,798,145,000 | 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 | 826,857,000 | 826,857,000 | 551,695,000
Derivative, Fair Value, Net | 0 | 0 | 0
Assets, Fair Value Disclosure | 875,435,000 | 875,435,000 | 577,870,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,827,731,000 | 5,827,731,000 | 6,231,774,000
Derivative, Fair Value, Net | 0 | 0 | 0
Assets, Fair Value Disclosure | 5,914,211,000 | 5,914,211,000 | 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 | 5,499,000 | 5,499,000 | 5,513,000
Assets, Fair Value Disclosure | 8,499,000 | 8,499,000 | 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 | 19,830,000 | 19,830,000 | 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 | 86,480,000 | 86,480,000 | 31,324,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 28,748,000 | 28,748,000 | 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 | 19,830,000 | 19,830,000 | 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 | 28,748,000 | 28,748,000 | 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 | 86,480,000 | 86,480,000 | 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 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,580,212,000 | 5,580,212,000 | 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 | 255,158,000 | 255,158,000 | 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 | 161,011,000 | 161,011,000 | 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 | 2,936,922,000 | 2,936,922,000 | 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 | 713,106,000 | 713,106,000 | 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 | 706,641,000 | 706,641,000 | 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 | 559,320,000 | 559,320,000 | 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 | 195,019,000 | 195,019,000 | 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 | 5,344,000 | 5,344,000 | 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 | 47,691,000 | 47,691,000 |
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 | 225,540,000 | 225,540,000 | 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 | 225,540,000 | 225,540,000 | 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 | 5,354,672,000 | 5,354,672,000 | 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 | 29,618,000 | 29,618,000 | 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 | 161,011,000 | 161,011,000 | 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 | 2,936,922,000 | 2,936,922,000 | 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 | 713,106,000 | 713,106,000 | 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 | 706,641,000 | 706,641,000 | 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 | 559,320,000 | 559,320,000 | 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 | 195,019,000 | 195,019,000 | 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 | 5,344,000 | 5,344,000 | 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 | 47,691,000 | 47,691,000 |
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 | 263,363,000 | 263,363,000 | 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 | 99,329,000 | 99,329,000 | 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 | 120,298,000 | 120,298,000 | 123,142,000
Trading Securities | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 10,147,000 | 10,147,000 | 13,000,000
Trading Securities | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 33,589,000 | 33,589,000 | 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 | 263,363,000 | 263,363,000 | 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 | 99,329,000 | 99,329,000 | 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 | 120,298,000 | 120,298,000 | 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 | 10,147,000 | 10,147,000 | 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 | 33,589,000 | 33,589,000 | 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 | 193,498,000 | 193,498,000 | 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 | 185,214,000 | 185,214,000 | 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 | 8,284,000 | 8,284,000 | 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 | 617,515,000 | 617,515,000 | 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 | 84,823,000 | 84,823,000 |
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 12,470,000 | 12,470,000 | 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 | 331,280,000 | 331,280,000 | 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 | 33,080,000 | 33,080,000 | 30,495,000
Short-term investments | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 4,748,000 | 4,748,000 |
Short-term investments | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 28,000 | 28,000 | 219,000
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 151,086,000 | 151,086,000 | 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 | 416,103,000 | 416,103,000 | 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 | 84,823,000 | 84,823,000 |
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 | 331,280,000 | 331,280,000 | 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 | 201,412,000 | 201,412,000 | 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 | 12,470,000 | 12,470,000 | 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 | 33,080,000 | 33,080,000 | 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 | 4,748,000 | 4,748,000 |
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 | 28,000 | 28,000 | 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 | 151,086,000 | 151,086,000 | 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 | $ 900,000 | $ 900,000 | $ 2,000,000

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