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Note 15 - Share-Based and Other Compensation Plans (RSUs - Equity Settled) (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
shares
Performance Based RSUs Equity Settled [Member] | 2016 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares 701,110    
Award Requisite Service Period 3 years    
Grants by Compensation Committee 701,110    
Maximum Payout Percentage of Target Award 200.00%    
Share Based Compensation, Maximum Multiplier for Target Payout 6    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Performance period 3 years    
Risk-free interest rate [1] 0.90%    
Volatility [2] 29.70%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate [3] 38.20%    
Dividend yield 0.08%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions [4] 10.70%    
Performance Based RSUs Equity Settled [Member] | 2015 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares   499,740  
Award Requisite Service Period   3 years  
Grants by Compensation Committee   499,740  
Maximum Payout Percentage of Target Award   200.00%  
Share Based Compensation, Maximum Multiplier for Target Payout   6  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Performance period   3 years  
Risk-free interest rate [1]   1.00%  
Volatility [2]   40.60%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate [3]   24.00%  
Dividend yield   0.05%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions [4]   13.90%  
Performance Based RSUs Equity Settled [Member] | 2014 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares     702,180
Award Requisite Service Period     3 years
Grants by Compensation Committee     702,180
Maximum Payout Percentage of Target Award     200.00%
Share Based Compensation, Maximum Multiplier for Target Payout     6
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Performance period     3 years
Risk-free interest rate [1]     1.00%
Volatility [2]     71.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate [3]     30.00%
Dividend yield     0.06%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions [4]     0.00%
Performance Based RSUs Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Award Requisite Service Period 3 years    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate [5] 1.72% 2.32% 2.57%
Volatility [6] 94.20% 93.70% 94.26%
Dividend yield 0.08% 0.05% 0.06%
Stock Options [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Stock Options [Member] | Share-based Compensation Award, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Timed-Vested RSUs Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Vesting period (in years) 3 years    
Timed-Vested RSUs Equity Settled [Member] | 2016 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares 273,726    
Grants by Compensation Committee 273,726    
Timed-Vested RSUs Equity Settled [Member] | 2016 Award Year [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares 180,380    
Grants by Compensation Committee 180,380    
Timed-Vested RSUs Equity Settled [Member] | 2016 Award Year [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares 93,346    
Grants by Compensation Committee 93,346    
Timed-Vested RSUs Equity Settled [Member] | 2015 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares   113,141  
Grants by Compensation Committee   113,141  
Timed-Vested RSUs Equity Settled [Member] | 2015 Award Year [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares   56,970  
Grants by Compensation Committee   56,970  
Timed-Vested RSUs Equity Settled [Member] | 2015 Award Year [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares   56,171  
Grants by Compensation Committee   56,171  
Timed-Vested RSUs Equity Settled [Member] | 2014 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares     170,176
Grants by Compensation Committee     170,176
Timed-Vested RSUs Equity Settled [Member] | 2014 Award Year [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares     85,133
Grants by Compensation Committee     85,133
Timed-Vested RSUs Equity Settled [Member] | 2014 Award Year [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, Number of Shares     85,043
Grants by Compensation Committee     85,043
Restricted Stock Units (RSUs) Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, Beginning of Period, Number of Shares 2,472,861    
Unvested, Beginning of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares $ 12.62    
Granted, Number of Shares 1,264,858    
Granted, Weighted Average Grant-Date Fair Value Per Share | $ / shares $ 11.79    
Vested, Number of Shares (431,520)    
Vested, Weighted Average Grant-Date Fair Value Per Share | $ / shares $ 13.47    
Forfeited, Number of Shares (97,745)    
Forfeited, Weighted Average Grant-Date Fair Value Per Share | $ / shares $ 16.00    
Unvested, End of Period, Number of Shares 3,208,454 2,472,861  
Unvested, End of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares $ 12.08 $ 12.62  
Grants by Compensation Committee 1,264,858    
Restricted Stock Units (RSUs) Equity Settled [Member] | 2016 Award Year [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Restricted Stock Units (RSUs) Equity Settled [Member] | 2016 Award Year [Member] | Share-based Compensation Award, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Restricted Stock Units (RSUs) Equity Settled [Member] | 2015 Award Year [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00%  
Restricted Stock Units (RSUs) Equity Settled [Member] | 2014 Award Year [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00%  
[1] The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.
[2] Volatility of Radian’s stock is used in the calculation of the grant date fair value of the portion of the awards based on TSR Measures, as described above. Volatility of Radian’s stock is not an applicable assumption for valuing the portion of the awards based on the cumulative growth in Radian’s book value per share. Volatility is determined at the date of grant using the historical share price volatility and the expected life of each award.
[3] Average volatility of peer companies is used in the calculation of the grant date fair value of the portion of the awards based on the Relative TSR Measures, as described above.
[4] A discount is applied to executive officer awards to reflect illiquidity during the one-year post-vesting holding period.
[5] The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.
[6] Volatility is determined at the date of grant using historical share price volatility and expected life of each award.