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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 2,487,445 | $ 1,893,356 |
Available-for-sale Securities | 2,523,835 | 1,940,891 |
Available-for-sale Equity Securities, Amortized Cost Basis | 500 | 75,538 |
Available-for-sale Securities, Equity Securities | 500 | 75,430 |
Amortized Cost Debt and Equity Securities | 2,487,945 | 1,968,894 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 50,650 | 6,297 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 14,760 | 34,300 |
US government and agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 152,233 | 13,773 |
Available-for-sale Securities | 153,303 | 13,752 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1,072 | 0 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 2 | 21 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 72,249 | 36,920 |
Available-for-sale Securities | 75,289 | 37,900 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3,160 | 1,100 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 120 | 120 |
Corporate bonds and notes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,027,955 | 815,024 |
Available-for-sale Securities | 1,056,504 | 802,193 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 34,065 | 4,460 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 5,516 | 17,291 |
RMBS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 304,401 | 226,744 |
Available-for-sale Securities | 307,516 | 224,905 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3,227 | 625 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 112 | 2,464 |
CMBS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 504,978 | 415,780 |
Available-for-sale Securities | 509,070 | 406,910 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 7,926 | 69 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 3,834 | 8,939 |
Other ABS |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 399,936 | 359,452 |
Available-for-sale Securities | 396,461 | 355,494 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 968 | 16 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 4,443 | 3,974 |
Foreign government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 25,693 | 25,663 |
Available-for-sale Securities | 25,192 | 24,307 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 232 | 27 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 733 | 1,383 |
Debt Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,487,445 | 1,893,356 |
Available-for-sale Securities | 2,523,335 | 1,865,461 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 50,650 | 6,297 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 14,760 | 34,192 |
Equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 500 | 75,538 | [1]
Available-for-sale Securities, Equity Securities | 500 | 75,430 | [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 | [1]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 108 | [1]
[1] | Comprising primarily a multi-sector exchange-traded fund.

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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=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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