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Note 5 - Investments Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Debt Securities [Line Items] |  |  |
Loaned securities |  | $ 22,606 | $ 27,860
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Total, Amortized Cost |  | 3,875,919 | 4,098,962
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Total, Fair Value |  | 3,897,584 | 4,021,575
Non Asset Backed Security Investments, Contractual Maturities [Member] |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Due in one year or less | [1] | 93,413 |
Due after one year through five years | [1] | 828,387 |
Due after five years through ten years | [1] | 1,051,235 |
Due after ten years | [1] | 369,044 |
Available-for-sale Securities, Fair Value |  |  |
Due in one year or less | [1] | 93,208 |
Due after one year through five years | [1] | 832,653 |
Due after five years through ten years | [1] | 1,060,529 |
Due after ten years | [1] | 376,401 |
RMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 348,746 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 350,238 |
CMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 512,190 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 515,604 |
Other ABS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Amortized Cost | [2] | 679,444 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Maturity, without Single Maturity Date, Fair Value | [2] | 675,477 |
Total fixed-maturities available for sale |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Fixed-maturity investments available for sale, Total, Amortized Cost | [3] | 3,882,459 |
Available-for-sale Securities, Fair Value |  |  |
Fixed-maturity investments available for sale, Total, Fair Value | [3] | 3,904,110 |
Securities Financing Transaction, Fair Value |  |  |
Total Debt Securities [Line Items] |  |  |
Loaned securities | [4] | 22,606 | 27,860
Fixed maturities | Securities Financing Transaction, Fair Value |  |  |
Total Debt Securities [Line Items] |  |  |
Loaned securities |  | $ 6,500 | $ 7,400
[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.
[3] | Includes securities loaned under securities lending agreements with a fair value of $6.5 million.
[4] | Our securities loaned under securities lending agreements are reported at fair value within other assets in our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.

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