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Note 10 - Losses and Loss Adjustment Expense Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) incident | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Number of Natural Disasters | incident |  | 2 |  |  |
Loss reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | $ 507,588 |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |
Balance at end of period |  | 412,460 |  |  | $ 507,588
Mortgage Insurance Segment |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 507,588 | $ 760,269 |  | 760,269
Less: Reinsurance recoverables | [1] | 8,350 | 6,851 |  | 6,851
Balance at beginning of period, net of reinsurance recoverables |  | 499,238 | 753,418 |  | 753,418
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract] |  |  |  |  |
Incurred Losses and LAE Current year | [2] | 100,047 | 145,798 |  |
Incurred Losses and LAE Prior years |  | (24,075) | (45,331) |  |
Total incurred losses and LAE |  | 75,972 | 100,467 |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |
Paid Losses and LAE Current year | [2] | 2,316 | 3,639 |  |
Paid losses and LAE Prior years |  | 173,911 | 301,228 |  |
Total paid losses and LAE |  | 176,227 | 304,867 | [3] |
Balance at end of period, net of reinsurance recoverables |  | 398,983 | 549,018 |  | 499,238
Add: Reinsurance recoverables | [1] | 9,997 | 7,470 |  | 8,350
Balance at end of period |  | $ 408,980 | $ 556,488 |  | 507,588
Default To Claim Rate Detail [Abstract] |  |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults |  | 8.50% | 10.50% |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount |  | $ 5,900 |  |  | 10,400
Mortgage Insurance Segment | Pool Insurance Mortgage Insurance Product |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | [4] | 13,463 |  |  |
Less: Reinsurance recoverables | [5] | 35 |  |  |
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract] |  |  |  |  |
Incurred Losses and LAE Prior years |  |  | $ 14,200 |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |
Add: Reinsurance recoverables | [5] | 20 |  |  | 35
Balance at end of period | [4] | 11,705 |  |  | 13,463
Mortgage Insurance Segment | Primary Mortgage Product |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |
Less: Reinsurance recoverables | [5] | 8,315 |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |
Add: Reinsurance recoverables | [5] | $ 9,977 |  |  | $ 8,315
Default To Claim Rate Detail [Abstract] |  |  |  |  |
Weighted Average Default To Claim Rate Assumption Net Of Denials Rescissions and Reinstatements |  | 34.00% |  |  | 31.00%
Weighted Average Default To Claim Rate Assumption Net Of Denials Rescissions and Reinstatements Excluding Defaults in FEMA Designated Areas |  | 35.00% |  |  | 38.00%
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults |  | 68.00% |  |  |
Gross Default To Claim Rate Estimate |  | 75.00% |  |  |
Mortgage Insurance Segment | Hurricanes Harvey and Irma [Member] | Primary Mortgage Product |  |  |  |  |
Default To Claim Rate Detail [Abstract] |  |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults |  | 3.00% |  |  |
2013 Freddie Mac Agreement [Member] | Radian Guaranty Inc [Member] | Mortgage Insurance Segment |  |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |
Paid losses and LAE Prior years |  |  | $ 54,800 |  |
[1] | Related to ceded losses recoverable, if any, on captive reinsurance transactions, the QSR Program and the Single Premium QSR Program. See Note 7 for additional information.
[2] | Related to underlying defaulted loans with a most recent default notice dated in the year indicated. For example, if a loan had defaulted in a prior year, but then subsequently cured and later re-defaulted in the current year, that default would be considered a current year default.
[3] | Includes the payment of $54.8 million made in connection with the scheduled final settlement of the Freddie Mac Agreement in the third quarter of 2017.
[4] | Includes reinsurance recoverable of $20 thousand and $35 thousand as of September 30, 2018 and December 31, 2017, respectively.
[5] | Represents ceded losses on captive reinsurance transactions, the QSR Program and the Single Premium QSR Program. These amounts are included in the reinsurance recoverables reported in other assets in our condensed consolidated balance sheets.

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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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