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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 5,349,405 |  | $ 5,393,623 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | (948) |  |  |
Less: loaned securities | 130,850 |  | 57,499 |  |  |
Fixed-maturity investments available for sale, Total, Fair Value | 5,572,813 |  | 5,723,340 |  |  |
Fixed-maturities available for sale | U.S. government and agencies securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 213,954 |  | 176,033 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,161 |  | 1,677 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (902) |  | (3,611) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 214,213 |  | 174,099 |  |  |
Fixed-maturities available for sale | State and municipal obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 141,431 |  | 149,258 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 16,635 |  | 16,113 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (122) |  | (100) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 157,944 |  | 165,271 |  |  |
Fixed-maturities available for sale | Corporate bonds and notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 2,909,453 |  | 2,832,350 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | $ (638) | (948) | $ (2,476) | $ 0 | $ 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 175,493 |  | 250,771 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (19,486) |  | (3,758) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 3,065,460 |  | 3,078,415 |  |  |
Fixed-maturities available for sale | RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 701,664 |  | 799,814 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 21,478 |  | 34,439 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,302) |  | (314) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 719,840 |  | 833,939 |  |  |
Fixed-maturities available for sale | CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 685,595 |  | 645,071 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 31,437 |  | 39,495 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2,361) |  | (3,301) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 714,671 |  | 681,265 |  |  |
Fixed-maturities available for sale | CLO |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 519,909 |  | 569,173 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,851 |  | 2,026 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (607) |  | (2,641) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 521,153 |  | 568,558 |  |  |
Fixed-maturities available for sale | Other ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 225,012 |  | 249,988 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,190 |  | 2,901 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (234) |  | (432) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 226,968 |  | 252,457 |  |  |
Fixed-maturities available for sale | Foreign government and agency securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,105 |  | 5,100 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 294 |  | 338 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,399 |  | 5,438 |  |  |
Fixed-maturities available for sale | Mortgage insurance-linked notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 45,384 |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,649 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |  |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 48,033 |  |  |  |  |
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,447,507 |  | 5,426,787 |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,349,405 |  | 5,393,623 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | (948) |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 253,188 |  | 347,760 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (27,014) |  | (14,157) |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,673,681 |  | 5,759,442 |  |  |
Fixed-maturity investments available for sale, Total, Fair Value | 5,572,813 |  | 5,723,340 |  |  |
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Less: loaned securities | 98,102 |  | 33,164 |  |  |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Less: loaned securities | $ 100,868 |  | $ 36,102 |  |  |

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