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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | $ 122,800 |  |
Loaned securities |  | 38,350 |  | $ 27,964
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 48,778
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | 16,434
Available-for-sale Securities, including Loaned Securities, Amortized Cost Basis |  |  |  | 3,617,103
Available-for-sale Securities, including Loaned Securities |  |  |  | 3,649,447
Available-for-sale Debt Securities, Amortized Cost Basis |  | 3,659,311 |  | 3,426,217
Fixed-maturities available for sale—at fair value (amortized cost $3,659,311 and $3,426,217) |  | 3,586,055 |  | 3,458,719
US government and agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | 10,600 |  |
Amortized Cost Debt and Equity Securities |  | 72,811 |  | 69,667
Available-for-sale Securities |  | 71,045 | [1] | 69,396
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1 |  | 96
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,767 |  | 367
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  | 136,649 |  | 156,587
Available-for-sale Securities |  | 137,699 |  | 161,722
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2,957 |  | 5,834
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,907 |  | 699
Corporate bonds and notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  | 1,987,444 |  | 1,869,318
Available-for-sale Securities |  | 1,933,044 |  | 1,894,886
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,617 |  | 33,620
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 59,017 |  | 8,052
RMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | 112,200 |  |
Amortized Cost Debt and Equity Securities |  | 249,577 |  | 189,455
Available-for-sale Securities |  | 243,659 | [2] | 187,229
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1 |  | 636
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 5,919 |  | 2,862
CMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  | 487,805 |  | 451,595
Available-for-sale Securities |  | 477,751 |  | 453,394
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 228 |  | 3,409
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 10,282 |  | 1,610
Other ABS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  | 694,613 |  | 672,715
Available-for-sale Securities |  | 692,564 |  | 674,548
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,132 |  | 2,655
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 3,181 |  | 822
Foreign government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  | 46,826 |  | 31,417
Available-for-sale Securities |  | 46,290 |  | 32,207
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 116 |  | 823
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 652 |  | 33
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  |  |  | 3,440,754
Available-for-sale Securities | [3] |  |  | 3,473,382
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 9,052 |  | 47,073
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 82,725 |  | 14,445
Available-for-sale Securities, including Loaned Securities, Amortized Cost Basis |  | 3,675,725 |  |
Available-for-sale Securities, including Loaned Securities | [4] | 3,602,052 |  |
Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Equity Securities, including Loaned Securities, Amortized Cost Basis | [5] |  |  | 176,349
Available-for-sale Securities, including Loaned Securities, Equity Securities | [3],[5] |  |  | 176,065
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | [5] |  |  | 1,705
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | [5] |  |  | 1,989
Securities Financing Transaction, Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Loaned securities | [6] | 38,350 |  | 27,964
Securities Financing Transaction, Fair Value [Member] | Fixed Maturities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Loaned securities |  | 16,000 |  | 14,700
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Loaned securities | [6] | 16,199 |  | 13,862
Securities Financing Transaction, Fair Value [Member] | Foreign government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Loaned securities | [6] | 222 |  | 867
Securities Financing Transaction, Fair Value [Member] | Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Loaned securities | [6] | $ 21,929 |  | $ 13,235
[1] | Includes securities with a fair value of $10.6 million serving as collateral for FHLB advances.
[2] | Includes securities with a fair value of $112.2 million serving as collateral for FHLB advances.
[3] | Includes $14.7 million of fixed maturity securities and $13.2 million of equity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
[4] | Includes $16.0 million of fixed maturity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
[5] | Primarily consists of investments in fixed-income and equity exchange-traded funds and publicly-traded business development company equities.
[6] | 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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