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Note 6 - Investments Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 66,442 | $ 27,860
Fixed-maturities available for sale—amortized cost | 4,549,534 | 4,098,962
Fixed-maturities available for sale—at fair value | 4,688,911 | 4,021,575
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 | 198,613 | 85,532
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 199,928 | 84,070
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,048 | 46
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 733 | 1,508
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 | 112,003 | 138,022
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 119,994 | 138,313
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 8,032 | 2,191
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 41 | 1,900
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 | 2,136,819 | 2,288,720
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 2,241,280 | 2,229,885
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 106,189 | 5,053
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,728 | 63,888
Fixed-maturities available for sale | RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
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
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 14,452 | 1,785
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,527 | 4,486
Fixed-maturities available for sale | CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
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
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 14,993 | 544
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 625 | 7,358
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 | 760,785 | 712,748
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 759,129 | 704,662
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,018 | 814
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,674 | 8,900
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 | 5,091 |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,224 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 133 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |
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 | 4,573,387 | 4,106,594
Fixed-maturities available for sale—amortized cost | 4,549,534 | 4,098,962
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 4,712,924 | 4,028,987
Fixed-maturities available for sale—at fair value | 4,688,911 | 4,021,575
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 147,865 | 10,433
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 8,328 | 88,040
Fixed-maturities available for sale | Securities Financing Transaction, Amortized Cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 23,853 | 7,632
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 24,000 |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 24,013 | $ 7,412

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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