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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 5,338,536 |  | $ 4,549,534
Debt Securities, Available-for-sale, Allowance for Credit Loss | 2,290 |  |
Less: loaned securities | 57,922 |  | 66,442
Fixed-maturity investments available for sale, Total, Fair Value | 5,628,992 |  | 4,688,911
Total fixed-maturities available for sale |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 5,351,426 |  |
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,642,447 |  |
Securities Financing Transaction, Cost | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less: loaned securities | 12,890 |  | 23,853
Securities Financing Transaction, Fair Value | U.S. government and agencies securities | Fair Value, Measurements, Recurring |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less: loaned securities |  |  | 35,309
Securities Financing Transaction, Fair Value | Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less: loaned securities | 13,932 |  | 3,669
Fixed-maturities available for sale | U.S. government and agencies securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 186,457 |  | 198,613
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,105 |  | 2,048
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,661) |  | (733)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 186,901 |  | 199,928
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 | 145,318 |  | 112,003
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 14,850 |  | 8,032
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (193) |  | (41)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 159,975 |  | 119,994
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 | 2,703,446 |  | 2,136,819
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,290) | $ (2,476) | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 218,127 |  | 106,189
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (7,471) |  | (1,728)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 2,911,812 |  | 2,241,280
Fixed-maturities available for sale | RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 813,006 |  | 766,429
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 37,137 |  | 14,452
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (30) |  | (1,527)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 850,113 |  | 779,354
Fixed-maturities available for sale | CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 686,414 |  | 593,647
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 37,339 |  | 14,993
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (4,791) |  | (625)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 718,962 |  | 608,015
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 | 811,687 |  | 760,785
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,051 |  | 2,018
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (6,350) |  | (3,674)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 809,388 |  | 759,129
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 | 5,098 |  | 5,091
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 198 |  | 133
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,296 |  | 5,224
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 | 5,351,426 |  | 4,573,387
Debt Securities, Available-for-sale, Amortized Cost | 5,338,536 |  | 4,549,534
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,290) |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 313,807 |  | 147,865
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (20,496) |  | (8,328)
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,642,447 |  | 4,712,924
Fixed-maturity investments available for sale, Total, Fair Value | 5,628,992 |  | 4,688,911
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Corporate bonds and notes |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less: loaned securities | 12,890 |  |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less: loaned securities | $ 13,455 |  | $ 24,013

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