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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | $ 3,440,462 |  | $ 2,857,798 |
Available-for-sale Securities | 3,478,709 |  | 2,839,842 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 49,063 |  | 20,827 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,816 |  | 38,783 |
US government and agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 61,287 |  | 78,931 |
Available-for-sale Securities | 60,860 |  | 75,474 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 187 |  | 2 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 614 |  | 3,459 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 125,485 |  | 66,124 |
Available-for-sale Securities | 129,507 |  | 67,171 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,461 |  | 1,868 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 439 |  | 821 |
Corporate bonds and notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 1,806,796 |  | 1,463,720 |
Available-for-sale Securities | 1,836,316 |  | 1,455,628 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 34,927 |  | 14,320 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,407 |  | 22,412 |
RMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 176,789 |  | 358,262 |
Available-for-sale Securities | 175,408 |  | 350,628 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 796 |  | 197 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,177 |  | 7,831 |
CMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 433,916 |  | 429,057 |
Available-for-sale Securities | 436,892 |  | 428,289 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,167 |  | 2,255 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,191 |  | 3,023 |
Other ABS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 616,687 |  | 433,603 |
Available-for-sale Securities | 618,832 |  | 434,728 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,627 |  | 2,037 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 482 |  | 912 |
Foreign government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 31,437 |  | 24,771 |
Available-for-sale Securities | 32,392 |  | 24,594 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 961 |  | 148 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6 |  | 325 |
Other than Securities Investment [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities |  |  | 2,000 |
Available-for-sale Securities |  |  | 2,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0 |
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 3,252,397 | [1] | 2,856,468 |
Available-for-sale Securities | 3,290,207 | [1] | 2,838,512 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 48,126 | [1] | 20,827 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,316 | [1] | 38,783 |
Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost Debt and Equity Securities | 188,065 | [1],[2] | 1,330 | [3]
Available-for-sale Securities | 188,502 | [1],[2] | 1,330 | [3]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 937 | [1],[2] | 0 | [3]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 500 | [1],[2] | $ 0 | [3]
[1] | Includes loaned securities under securities lending agreements that are classified as other assets in our condensed consolidated balance sheets, as further described below.
[2] | Primarily consists of investments in fixed income and equity exchange-traded funds and publicly-traded business development company equities.
[3] | Primarily consists of investments in Federal Home Loan Bank stock as required in connection with the memberships of Radian Guaranty and Radian Reinsurance in the FHLB.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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