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Note 10 - Losses and LAE Rescissions And Denials (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Rescissions And Denials [Line Items] |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) (Note 10) | $ 556,488 | $ 760,269 |  |
Mortgage Insurance Segment |  |  |  |
Rescissions And Denials [Line Items] |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 10.50% | 12.00% | 12.00% |
Decrease To Our Loss Reserves Due To Estimated Rescissions And Denials | $ 23,000 | $ 39,000 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | 24,800 | 14,300 |  |
Reserve for losses and loss adjustment expense (“LAE”) (Note 10) | 556,488 | 760,269 | $ 821,934 | $ 976,399
2013 Freddie Mac Agreement [Member] |  |  |  |
Rescissions And Denials [Line Items] |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) (Note 10) | 2,800 |  |  |
2013 Freddie Mac Agreement [Member] | Radian Guaranty Inc [Member] |  |  |  |
Rescissions And Denials [Line Items] |  |  |  |
Marketable Securities, Restricted | $ 5,500 | $ 63,900 |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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