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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, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Fair Value by Hierarchy Level [Line Items] |  |  |
Other Investments | $ 5,472,000 | $ 5,472,000 | $ 4,072,000
Less: loaned securities | 57,922,000 | 57,922,000 | 66,442,000
Investments Measured at NAV |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Other Investments | 2,500,000 | 2,500,000 |
Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 6,579,105,000 | 6,579,105,000 | 5,654,675,000
Assets, Fair Value Disclosure | 6,637,027,000 | 6,637,027,000 | 5,721,117,000
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
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 503,483,000 | 503,483,000 | 597,506,000
Assets, Fair Value Disclosure | 547,473,000 | 547,473,000 | 660,279,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 6,075,622,000 | 6,075,622,000 | 5,057,169,000
Assets, Fair Value Disclosure | 6,089,554,000 | 6,089,554,000 | 5,060,838,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Assets, Fair Value Disclosure | 5,500,000 | 5,500,000 | 400,000
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 |  |  | 35,309,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 13,932,000 | 13,932,000 | 3,669,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 43,990,000 | 43,990,000 | 27,464,000
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 |  |  | 35,309,000
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 | 43,990,000 | 43,990,000 | 27,464,000
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
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 | 13,932,000 | 13,932,000 | 3,669,000
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
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,628,992,000 | 5,628,992,000 | 4,688,911,000
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 | 186,901,000 | 186,901,000 | 179,584,000
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 | 159,975,000 | 159,975,000 | 119,994,000
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 | 2,898,357,000 | 2,898,357,000 | 2,237,611,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 850,113,000 | 850,113,000 | 779,354,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 718,962,000 | 718,962,000 | 608,015,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 809,388,000 | 809,388,000 | 759,129,000
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 | 5,296,000 | 5,296,000 | 5,224,000
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 | 157,407,000 | 157,407,000 | 143,884,000
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 | 157,407,000 | 157,407,000 | 143,884,000
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 | 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 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 5,471,585,000 | 5,471,585,000 | 4,545,027,000
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 | 29,494,000 | 29,494,000 | 35,700,000
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 | 159,975,000 | 159,975,000 | 119,994,000
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 | 2,898,357,000 | 2,898,357,000 | 2,237,611,000
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 | 850,113,000 | 850,113,000 | 779,354,000
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 | 718,962,000 | 718,962,000 | 608,015,000
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 | 809,388,000 | 809,388,000 | 759,129,000
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 | 5,296,000 | 5,296,000 | 5,224,000
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Less: loaned securities | 13,455,000 | 13,455,000 | 24,013,000
Trading Securities | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 291,650,000 | 291,650,000 | 317,150,000
Trading Securities | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 120,547,000 | 120,547,000 | 118,949,000
Trading Securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 122,858,000 | 122,858,000 | 147,232,000
Trading Securities | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 13,930,000 | 13,930,000 | 16,180,000
Trading Securities | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 34,315,000 | 34,315,000 | 34,789,000
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 | 291,650,000 | 291,650,000 | 317,150,000
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 | 120,547,000 | 120,547,000 | 118,949,000
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 | 122,858,000 | 122,858,000 | 147,232,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 13,930,000 | 13,930,000 | 16,180,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 34,315,000 | 34,315,000 | 34,789,000
Equity securities | Fair Value, Measurements, Recurring | Equity securities |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 91,317,000 | 91,317,000 | 130,221,000
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 | 84,255,000 | 84,255,000 | 124,009,000
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 | 7,062,000 | 7,062,000 | 6,212,000
Short-term investments | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 567,146,000 | 567,146,000 | 518,393,000
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 | 29,716,000 | 29,716,000 | 127,152,000
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 26,973,000 | 26,973,000 | 21,475,000
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 232,105,000 | 232,105,000 | 202,461,000
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 106,013,000 | 106,013,000 | 20,298,000
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 172,339,000 | 172,339,000 | 147,007,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Total Investments at Fair Value | 261,821,000 | 261,821,000 | 329,613,000
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 | 29,716,000 | 29,716,000 | 127,152,000
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 | 232,105,000 | 232,105,000 | 202,461,000
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 | 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 | 305,325,000 | 305,325,000 | 188,780,000
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 | 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 | 26,973,000 | 26,973,000 | 21,475,000
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 | 106,013,000 | 106,013,000 | 20,298,000
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 | 172,339,000 | 172,339,000 | 147,007,000
Partnership investment |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Other Investments |  |  | 2,600,000
Convertible promissory note |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |
Other Investments | $ 3,000,000.0 | $ 3,000,000.0 | $ 1,500,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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