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Note 5 - Investments Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale Securities, Amortized Cost |  |  |
Loaned securities |  | $ 65,444 | $ 27,860
Fixed-maturities available for sale—at amortized cost |  | 4,369,273 | 4,098,962
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Total, Fair Value |  | 4,527,223 | 4,021,575
Non Asset Backed Security Investments, Contractual Maturities [Member] |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Due in one year or less | [1] | 132,819 |
Due after one year through five years | [1] | 885,660 |
Due after five years through ten years | [1] | 1,108,946 |
Due after ten years | [1] | 409,043 |
Available-for-sale Securities, Fair Value |  |  |
Due in one year or less | [1] | 132,897 |
Due after one year through five years | [1] | 903,546 |
Due after five years through ten years | [1] | 1,168,298 |
Due after ten years | [1] | 455,841 |
RMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 605,687 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 619,935 |
CMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 542,284 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 563,338 |
Other ABS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 718,854 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 717,986 |
Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 4,403,293 |
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 4,561,841 |
Fixed maturities | RMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 605,687 | 334,843
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 619,935 | 332,142
Fixed maturities | CMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 542,284 | 546,729
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 563,338 | 539,915
Fixed maturities | Other ABS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 718,854 | 712,748
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 717,986 | 704,662
Fixed maturities | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities |  | 4,403,293 | 4,106,594
Fixed-maturities available for sale—at amortized cost |  | 4,369,273 | 4,098,962
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities |  | 4,561,841 | 4,028,987
Fixed-maturity investments available for sale, Total, Fair Value |  | 4,527,223 | 4,021,575
Fixed maturities | Securities Financing Transaction, Cost | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Loaned securities |  | 34,020 | 7,632
Fixed maturities | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Loaned securities |  | $ 34,618 | $ 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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