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Note 9 - Losses and LAE Mortgage Insurance Reserves by Product (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverables | $ 15,155 us-gaap_ReinsuranceRecoverables |  | $ 28,119 us-gaap_ReinsuranceRecoverables |  |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) | 1,384,714 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,560,032 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,893,960 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |
Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverables | 13,365 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 26,665 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 25,751 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 38,363 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1]
Reserve for losses and loss adjustment expense (“LAE”) | 1,384,714 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,560,032 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,893,960 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 2,164,353 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
Prime Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Liability for Unpaid Claims | 640,919 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimeMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 700,174 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimeMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
First Lien Mortgage Insurance Products [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) | 1,383,659 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_FirstLienMortgageInsuranceProductsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,558,615 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_FirstLienMortgageInsuranceProductsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Second Lien Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) | 1,055 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_SecondLienMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2] | 1,417 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_SecondLienMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2] |  |  |  |
Alt A Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Liability for Unpaid Claims | 278,350 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_AltMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 292,293 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_AltMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
A Minus and Below Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Liability for Unpaid Claims | 163,390 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_MinusAndBelowMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 179,103 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_MinusAndBelowMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Primary Mortgage Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Liability for Incurred but Not Reported Claims | 167,204 rdn_LiabilityforIncurredButNotReportedClaimsandOther / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 223,114 rdn_LiabilityforIncurredButNotReportedClaimsandOther / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Liability for Claims Adjustment Expense | 53,210 rdn_LiabilityforClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 56,164 rdn_LiabilityforClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Reinsurance recoverables | 13,365 us-gaap_ReinsuranceRecoverables / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] | 26,665 us-gaap_ReinsuranceRecoverables / rdn_MortgageInsuranceDescriptionAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] |  |  |  |
Total Primary Insurance Mortgage Insurance Products [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) | 1,316,438 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_TotalPrimaryInsuranceMortgageInsuranceProductsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,477,513 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_TotalPrimaryInsuranceMortgageInsuranceProductsMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Pool Insurance Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |  |
Liability for Unpaid Claims | 62,943 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 75,785 rdn_LiabilityforUnpaidClaims / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Liability for Incurred but Not Reported Claims | 1,227 rdn_LiabilityforIncurredButNotReportedClaimsandOther / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,775 rdn_LiabilityforIncurredButNotReportedClaimsandOther / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Liability for Claims Adjustment Expense | 3,051 rdn_LiabilityforClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 3,542 rdn_LiabilityforClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Reserve for losses and loss adjustment expense (“LAE”) | $ 67,221 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | $ 81,102 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / rdn_MortgageInsuranceDescriptionAxis = rdn_PoolInsuranceMortgageInsuranceProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
[1] | Related to ceded losses on captive reinsurance transactions and the QSR Reinsurance Transactions. See Note 7 for additional information.
[2] | Does not include our Second-lien PDR that is included in other liabilities.
[3] | Primarily represents ceded losses on captive transactions and the QSR Reinsurance Transactions.

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- Definition The actual and estimated costs of settling claims under the terms of the underlying insurance policies and assumed and ceded insurance contracts as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated costs as of the balance sheet date of settling insured claims that have not yet been submitted to the insurer for reimbursement, as well as reserves for estimated reinstatements of previously rescinded policies and denied claims and other reserves for other potential payment of claims. + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This concept represents the amount of reserve for losses excluding amounts for loss adjustment expenses. + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Details
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