XML 35 R50.htm IDEA: XBRL DOCUMENT
v3.19.3

Note 5 - Investments Net Unrealized Gains (Losses) on Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Net changes in unrealized gains (losses) on investments | $ 4,742 | $ 820 | $ 28,068 | $ (15,538)
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 4,132 | (2,581) | 18,962 | (18,431)
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, Change in Unrealized Holding Gain (Loss) | 563 | 2,971 | 9,170 | 2,238
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other Investments, Change in Unrealized Holding Gain (Loss) | $ 47 | $ 430 | $ (64) | $ 655

X
- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in equity securities and securities classified as trading. + References No definition available. + Details
Name: | rdn_ChangeinUnrealizedHoldingGainLoss
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the change in unrealized holding gain (loss) recognized in the income statement for investments in equity securities. + References No definition available. + Details
Name: | rdn_EquitySecuritiesChangeinUnrealizedHoldingGainLoss
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Investments, Change in Unrealized Holding Gain (Loss) + References No definition available. + Details
Name: | rdn_OtherInvestmentsChangeinUnrealizedHoldingGainLoss
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
Name: | us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rdn_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |