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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net cash provided by (used in) operating activities, continuing operations | $ 80 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ (121,846)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in operating activities, discontinued operations | (12,168)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (15,164)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash used in operating activities | (12,088)us-gaap_NetCashProvidedByUsedInOperatingActivities | (137,010)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |
Proceeds from sales of fixed-maturity investments available for sale | 3,621 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | 1,742 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Proceeds from sales of trading securities | 69,915 us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment | 383,967 us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
Proceeds from redemptions of fixed-maturity investments available for sale | 5,502 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from redemptions of fixed-maturity investments held to maturity | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities | 300 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Purchases of fixed-maturity investments available for sale | (152,290)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (71,173)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales (purchases) and redemptions of short-term investments, net | 106,728 us-gaap_PaymentsForProceedsFromShortTermInvestments | (182,936)us-gaap_PaymentsForProceedsFromShortTermInvestments
Sales of other assets, net | 632 us-gaap_ProceedsFromSaleOfOtherProductiveAssets | 640 us-gaap_ProceedsFromSaleOfOtherProductiveAssets
Purchases of property and equipment, net | (2,470)us-gaap_PaymentsForProceedsFromProductiveAssets | (2,769)us-gaap_PaymentsForProceedsFromProductiveAssets
Acquisitions, net of cash acquired | (6,449)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash provided by investing activities, continuing operations | 25,189 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 129,771 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash provided by investing activities, discontinued operations | 9,514 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | 4,681 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash provided by investing activities | 34,703 us-gaap_NetCashProvidedByUsedInInvestingActivities | 134,452 us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |
Dividends paid | (478)us-gaap_PaymentsOfDividendsCommonStock | (433)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits from stock-based awards | 1,408 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 89 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by (used in) financing activities, continuing operations | 930 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (344)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash provided by (used in) financing activities, discontinued operations | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net cash provided by (used in) financing activities | 930 us-gaap_NetCashProvidedByUsedInFinancingActivities | (344)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash | (46)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 7 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash | 23,499 rdn_CashandCashEquivalentsPeriodIncreaseDecreaseIncludingDiscontinuedOperations | (2,895)rdn_CashandCashEquivalentsPeriodIncreaseDecreaseIncludingDiscontinuedOperations
Cash, beginning of period | 30,465 us-gaap_CashAndCashEquivalentsAtCarryingValue | 22,880 us-gaap_CashAndCashEquivalentsAtCarryingValue
Change in cash of business held for sale | 3,240 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | (387)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Cash, end of period | 57,204 us-gaap_CashAndCashEquivalentsAtCarryingValue | 19,598 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information: |  |
Income taxes (received) paid | (41)us-gaap_IncomeTaxesPaidNet | 1,592 us-gaap_IncomeTaxesPaidNet
Interest paid | $ 4,516 us-gaap_InterestPaid | $ 4,520 us-gaap_InterestPaid

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- Definition Amount of increase (decrease) in cash and cash equivalents including discontinued operations. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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