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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 5,404,119 | $ 5,393,623 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (638) | (948) |
Less: loaned securities | 134,304 | 57,499 |
Fixed-maturity investments available for sale, Total, Fair Value | 5,553,711 | 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 | 172,927 | 176,033 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 323 | 1,677 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (8,681) | (3,611) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 164,569 | 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 | 151,222 | 149,258 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 11,326 | 16,113 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,510) | (100) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 161,038 | 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 | 2,938,328 | 2,832,350 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (638) | (948) | $ 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 145,509 | 250,771 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (47,600) | (3,758) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 3,035,599 | 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 | 752,109 | 799,814 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 25,667 | 34,439 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,666) | (314) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 774,110 | 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 | 685,914 | 645,071 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 27,763 | 39,495 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (5,330) | (3,301) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 708,347 | 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 | 561,013 | 569,173 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,183 | 2,026 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (608) | (2,641) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 562,588 | 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 | 236,464 | 249,988 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,334 | 2,901 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (461) | (432) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 238,337 | 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 | 5,102 | 5,100 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 291 | 338 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,393 | 5,438 |
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 | 5,503,079 | 5,426,787 |
Debt Securities, Available-for-sale, Amortized Cost | 5,404,119 | 5,393,623 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (638) | (948) |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 215,396 | 347,760 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (67,856) | (14,157) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,649,981 | 5,759,442 |
Fixed-maturity investments available for sale, Total, Fair Value | 5,553,711 | 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 | 98,960 | 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 | $ 96,270 | $ 36,102 |

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