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Note 5 - Investments Available for Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 4,804,453 |  |  | $ 4,804,453 |  |  |  | $ 4,549,534 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,476) |  |  | (2,476) |  |  |  |  |
Loaned securities | 16,332 |  |  | 16,332 |  |  |  | 66,442 |
Fixed-maturities available for sale—at fair value, net of allowance for credit losses of $2,476 as of June 30, 2020 (amortized cost of $4,804,453 and $4,549,534) | 5,070,091 |  |  | 5,070,091 |  |  |  | 4,688,911 |
Current provision for securities without prior allowance | 2,782 |  | $ 0 | 2,782 |  | $ 0 |  |  |
Foreign government and agency securities |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  |  |  |  |  |  |  | 5,091 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  |  |  |  |  | 133 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  |  |  |  | 0 |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  |  |  |  |  |  |  | 5,224 |
Total fixed-maturities available for sale |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 4,806,448 |  |  | 4,806,448 |  |  |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,072,210 |  |  | 5,072,210 |  |  |  |  |
Securities Financing Transaction, Fair Value | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Securities Loaned, Asset, Amortized Cost Basis | 1,995 |  |  | 1,995 |  |  |  | 23,853 |
Loaned securities | 2,119 | [1] |  | 2,119 | [1] |  |  | 3,669 | [2]
Fixed-maturities available for sale | US government and agency securities |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 122,956 |  |  | 122,956 |  |  |  | 198,613 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 10,087 |  |  | 10,087 |  |  |  | 2,048 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |  | 0 |  |  |  | (733) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 133,043 |  |  | 133,043 |  |  |  | 199,928 |
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 | 109,106 |  |  | 109,106 |  |  |  | 112,003 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 14,102 |  |  | 14,102 |  |  |  | 8,032 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (91) |  |  | (91) |  |  |  | (41) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 123,117 |  |  | 123,117 |  |  |  | 119,994 |
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 | 2,455,572 |  |  | 2,455,572 |  |  |  | 2,136,819 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,476) |  |  | (2,476) |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 201,051 |  |  | 201,051 |  |  |  | 106,189 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,572) |  |  | (3,572) |  |  |  | (1,728) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 2,650,575 |  |  | 2,650,575 |  |  |  | 2,241,280 |
Accumulated Allowance for Credit Loss, Available-for-sale Debt Securities | 2,476 |  |  | 2,476 |  |  | $ 0 | 0 |
Reduction for securities sold | (306) |  |  | (306) |  |  |  |  |
Fixed-maturities available for sale | RMBS |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 798,750 |  |  | 798,750 |  |  |  | 766,429 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 37,101 |  |  | 37,101 |  |  |  | 14,452 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (82) |  |  | (82) |  |  |  | (1,527) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 835,769 |  |  | 835,769 |  |  |  | 779,354 |
Fixed-maturities available for sale | CMBS |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 614,556 |  |  | 614,556 |  |  |  | 593,647 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 31,600 |  |  | 31,600 |  |  |  | 14,993 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (8,665) |  |  | (8,665) |  |  |  | (625) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 637,491 |  |  | 637,491 |  |  |  | 608,015 |
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 | 700,412 |  |  | 700,412 |  |  |  | 760,785 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,962 |  |  | 1,962 |  |  |  | 2,018 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (15,499) |  |  | (15,499) |  |  |  | (3,674) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 686,875 |  |  | 686,875 |  |  |  | 759,129 |
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 | 5,096 |  |  | 5,096 |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 244 |  |  | 244 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |  | 0 |  |  |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,340 |  |  | 5,340 |  |  |  |  |
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 | 4,806,448 |  |  | 4,806,448 |  |  |  | 4,573,387 |
Debt Securities, Available-for-sale, Amortized Cost | 4,804,453 |  |  | 4,804,453 |  |  |  | 4,549,534 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,476) |  |  | (2,476) |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 296,147 |  |  | 296,147 |  |  |  | 147,865 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (27,909) |  |  | (27,909) |  |  |  | (8,328) |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,072,210 |  |  | 5,072,210 |  |  |  | 4,712,924 |
Fixed-maturities available for sale—at fair value, net of allowance for credit losses of $2,476 as of June 30, 2020 (amortized cost of $4,804,453 and $4,549,534) | $ 5,070,091 |  |  | $ 5,070,091 |  |  |  | 4,688,911 |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Loaned securities |  |  |  |  |  |  |  | $ 24,013 |
[1] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[2] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.

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