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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 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 |  | $ 28,100 |  |  |
Loaned securities |  | 44,396 |  | $ 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 |
US government and agency securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | 4,800 |  |  |
Amortized Cost Debt and Equity Securities |  | 65,278 |  | 69,667 |
Available-for-sale Securities |  | 63,656 | [1] | 69,396 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |  | 96 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,622 |  | 367 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 157,176 |  | 156,587 |
Available-for-sale Securities |  | 159,329 |  | 161,722 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 3,882 |  | 5,834 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,729 |  | 699 |
Corporate bonds and notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 1,910,482 |  | 1,869,318 |
Available-for-sale Securities |  | 1,881,117 |  | 1,894,886 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 10,525 |  | 33,620 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 39,890 |  | 8,052 |
RMBS |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | 23,300 |  |  |
Amortized Cost Debt and Equity Securities |  | 233,144 |  | 189,455 |
Available-for-sale Securities |  | 228,040 | [2] | 187,229 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 128 |  | 636 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 5,232 |  | 2,862 |
CMBS |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 476,601 |  | 451,595 |
Available-for-sale Securities |  | 470,834 |  | 453,394 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,085 |  | 3,409 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 6,852 |  | 1,610 |
Other ABS |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 736,967 |  | 672,715 |
Available-for-sale Securities |  | 736,518 |  | 674,548 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,819 |  | 2,655 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 2,268 |  | 822 |
Foreign government securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 32,412 |  | 31,417 |
Available-for-sale Securities |  | 32,396 |  | 32,207 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 257 |  | 823 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 273 |  | 33 |
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost Debt and Equity Securities |  | 3,612,060 |  | 3,440,754 |
Available-for-sale Securities |  | 3,571,890 | [3] | 3,473,382 | [4]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 17,696 |  | 47,073 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 57,866 |  | 14,445 |
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 | [4],[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] | 44,396 |  | 27,964 |
Securities Financing Transaction, Fair Value [Member] | Fixed Maturities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Loaned securities |  | 17,200 |  | 14,700 |
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Loaned securities | [6] | 15,508 |  | 13,862 |
Securities Financing Transaction, Fair Value [Member] | Foreign government securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Loaned securities | [6] | 904 |  | 867 |
Securities Financing Transaction, Fair Value [Member] | Equity securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Loaned securities | [6] | $ 27,009 |  | $ 13,235 |
[1] | Includes securities with a fair value of $4.8 million serving as collateral for FHLB advances.
[2] | Includes securities with a fair value of $23.3 million serving as collateral for FHLB advances.
[3] | Includes $17.2 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.
[4] | 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.
[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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