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Note 5 - Investments Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 4,564,616 | $ 4,549,534
Loaned securities | 47,520 | 66,442
Debt Securities, Available-for-sale | 4,603,613 | 4,688,911
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
Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 4,569,995 |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 4,607,397 |
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 | 148,382 | 198,613
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 159,240 | 199,928
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 10,858 | 2,048
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 733
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 | 111,831 | 112,003
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 116,975 | 119,994
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,462 | 8,032
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 318 | 41
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 | 2,239,543 | 2,136,819
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 2,268,850 | 2,241,280
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 77,884 | 106,189
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 48,577 | 1,728
Fixed-maturities available for sale | RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 747,271 | 766,429
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 779,590 | 779,354
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 33,122 | 14,452
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 803 | 1,527
Fixed-maturities available for sale | CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 609,518 | 593,647
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 610,877 | 608,015
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 13,356 | 14,993
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 11,997 | 625
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 | 708,357 | 760,785
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 666,918 | 759,129
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,251 | 2,018
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 42,690 | 3,674
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 | 5,093 |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 4,947 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 146 |
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 | 4,569,995 | 4,573,387
Debt Securities, Available-for-sale, Amortized Cost | 4,564,616 | 4,549,534
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 4,607,397 | 4,712,924
Debt Securities, Available-for-sale | 4,603,613 | 4,688,911
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 141,933 | 147,865
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 104,531 | 8,328
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities Loaned, Asset, Amortized Cost Basis | 5,379 | 23,853
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 | $ 3,784 | $ 24,013

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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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