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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 1,507,522 | $ 528,660 |
Available-for-sale Securities | 1,497,313 | 680,258 |
Available-for-sale Equity Securities, Amortized Cost Basis | 573 | 76,900 |
Available-for-sale Securities, Equity Securities | 985 | 143,368 |
Amortized Cost Debt and Equity Securities | 1,508,095 | 605,560 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 9,289 | 77,231 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 20,071 | 2,533 |
US government and agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 5,764 | 5,709 |
Available-for-sale Securities | 5,793 | 5,751 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 29 | 48 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 6 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 17,581 | 17,727 |
Available-for-sale Securities | 18,576 | 18,910 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 995 | 1,183 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Corporate bonds and notes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 614,635 | 277,678 |
Available-for-sale Securities | 606,260 | 284,408 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3,753 | 7,288 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 12,128 | 558 |
RMBS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 208,011 | 41,467 |
Available-for-sale Securities | 209,028 | 42,520 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1,377 | 1,053 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 360 | 0 |
CMBS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 307,216 | 57,358 |
Available-for-sale Securities | 305,700 | 58,234 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1,533 | 876 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 3,049 | 0 |
Other ABS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 330,986 | 109,420 |
Available-for-sale Securities | 328,746 | 107,701 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1,088 | 8 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 3,328 | 1,727 |
Foreign government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 23,329 | 19,301 |
Available-for-sale Securities | 22,225 | 19,366 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 102 | 307 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 1,206 | 242 |
Debt Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,507,522 | 528,660 |
Available-for-sale Securities | 1,496,328 | 536,890 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 8,877 | 10,763 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 20,071 | 2,533 |
Equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 573 | 76,900 | [1]
Available-for-sale Securities, Equity Securities | 985 | 143,368 | [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 412 | 66,468 | [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | 0 | [1]
Private Equity Funds, Domestic [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Equity Securities |  | 143,000 |
Preferred Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Equity Securities |  | $ 400 |
[1] | Comprising broadly diversified domestic equity mutual funds ($143.0 million fair value) and a preferred stock investment in Freddie Mac ($0.4 million fair value).

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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