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Schedule IV Reinsurance
 12 Months Ended
Dec. 31, 2019
Reinsurance Insurance Premiums Earned [Abstract]  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Text Block]
Radian Group Inc.
Schedule IV—Reinsurance
Insurance Premiums Earned
Years Ended December 31, 2019, 2018 and 2017
($ in thousands)
Gross
Amount
 
Ceded to
Other
Companies
 
Assumed
from
Other
Companies
 
Net Amount
 
Assumed
Premiums as a
Percentage
of Net
Premiums
2019
$
1,244,870

 
$
109,903

 
$
10,382

 
$
1,145,349

 
0.91
%
2018
$
1,074,298

 
$
67,195

 
$
6,904

 
$
1,014,007

 
0.68
%
2017
$
990,016

 
$
57,271

 
$
28

 
$
932,773

 
0.00
%