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Note 6 - Investments Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturities, Available-for-sale, Amortized Cost |  | $ 4,549,534 | $ 4,098,962
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturities available for sale—at fair value |  | 4,688,911 | 4,021,575
Securities Loaned, Asset |  | 66,442 | 27,860
Fixed-maturities available for sale | Non Asset Backed Security Investments, Contractual Maturities |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Due in one year or less |  | 146,985 |
Due after one year through five years | [1] | 834,096 |
Due after five years through ten years | [1] | 1,062,725 |
Due after ten years | [1] | 408,720 |
Available-for-sale Securities, Fair Value |  |  |
Due in one year or less |  | 147,541 |
Due after one year through five years | [1] | 852,660 |
Due after five years through ten years | [1] | 1,121,536 |
Due after ten years | [1] | 444,689 |
Fixed-maturities available for sale | RMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 766,429 |
Available-for-sale Securities, Fair Value |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | [2] | 779,354 |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 766,429 | 334,843
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 779,354 | 332,142
Fixed-maturities available for sale | CMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 593,647 |
Available-for-sale Securities, Fair Value |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | [2] | 608,015 |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 593,647 | 546,729
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 608,015 | 539,915
Fixed-maturities available for sale | Other ABS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 760,785 |
Available-for-sale Securities, Fair Value |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | [2] | 759,129 |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 760,785 | 712,748
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 759,129 | 704,662
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturities, Available-for-sale, Amortized Cost |  | 4,549,534 | 4,098,962
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturities available for sale—at fair value |  | 4,688,911 | 4,021,575
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 4,573,387 | 4,106,594
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 4,712,924 | 4,028,987
Securities Financing Transaction, Amortized Cost | Fixed-maturities available for sale | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Fair Value |  |  |
Securities Loaned, Asset |  | 23,853 | 7,632
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale |  |  |
Available-for-sale Securities, Fair Value |  |  |
Securities Loaned, Asset |  | 24,000 |
Securities Financing Transaction, Fair Value | Fixed-maturities available for sale | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Fair Value |  |  |
Securities Loaned, Asset |  | $ 24,013 | $ 7,412
[1] | Actual maturities may differ as a result of calls before scheduled maturity.
[2] | RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.

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