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Schedule IV Reinsurance
 12 Months Ended
Dec. 31, 2012
Reinsurance Insuarnce Premiums Earned [Abstract]  
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]
Radian Group Inc.
Schedule IV—Reinsurance
Insurance Premiums Earned
Years Ended December 31, 2012, 2011 and 2010
 
($ in thousands)
Gross
Amount
 
Ceded to
Other
Companies
 
Assumed
from
Other
Companies
 
Net Amount
 
Assumed
Premiums as a
Percentage
of Net
Premiums
2012
$
796,253

 
$
53,700

 
$
(3,571
)
 
$
738,982

 
(0.48
%)
2011
$
762,428

 
$
38,740

 
$
32,337

 
$
756,025

 
4.28
 %
2010
$
891,167

 
$
94,497

 
$
29,063

 
$
825,733

 
3.52
 %