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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 57,499 | $ 66,442
Fixed-maturities available for sale—amortized cost | 5,393,623 | 4,549,534
Fixed-maturities available for sale—at fair value | 5,723,340 | 4,688,911
Allowance for Credit Losses | (948) |
Fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Credit Losses | (948) |
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 | 176,033 | 198,613
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 174,099 | 199,928
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,677 | 2,048
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,611) | (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 | 149,258 | 112,003
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 165,271 | 119,994
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 16,113 | 8,032
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (100) | (41)
Allowance for Credit Losses | 0 |
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 | 2,832,350 | 2,136,819
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 3,078,415 | 2,241,280
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 250,771 | 106,189
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,758) | (1,728)
Allowance for Credit Losses | 948 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 1,254 |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery | 0 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (306) |
Fixed-maturities available for sale | RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 799,814 | 766,429
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 833,939 | 779,354
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 34,439 | 14,452
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (314) | (1,527)
Allowance for Credit Losses | 0 |
Fixed-maturities available for sale | CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 645,071 | 574,037
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 681,265 | 588,420
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 39,495 | 14,993
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (3,301) | (610)
Allowance for Credit Losses | 0 |
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 | 249,988 | 314,946
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 252,457 | 316,163
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,901 | 1,789
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (432) | (572)
Allowance for Credit Losses | 0 |
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 | 5,100 | 5,091
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,438 | 5,224
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 338 | 133
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Allowance for Credit Losses | 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 | 5,426,787 | 4,573,387
Fixed-maturities available for sale—amortized cost | 5,393,623 | 4,549,534
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 5,759,442 | 4,712,924
Fixed-maturities available for sale—at fair value | 5,723,340 | 4,688,911
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 347,760 | 147,865
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (14,157) | (8,328)
Allowance for Credit Losses | 948 |
Fixed-maturities available for sale | US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Credit Losses | 0 |
Fixed-maturities available for sale | CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities | 569,173 | 465,449
Available-for-sale Securities, Debt Securities, Including Loaned Securities | 568,558 | 462,561
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,026 | 229
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2,641) | (3,117)
Allowance for Credit Losses | 0 |
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 | 33,164 | 23,853
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 36,100 |
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 | $ 36,102 | $ 24,013

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