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Schedule IV Reinsurance
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016
($ in thousands)
Gross
Amount
 
Ceded to
Other
Companies
 
Assumed
from
Other
Companies
 
Net Amount
 
Assumed
Premiums as a
Percentage
of Net
Premiums
2018
$
1,074,298

 
$
67,195

 
$
6,904

 
$
1,014,007

 
0.68
%
2017
$
990,016

 
$
57,271

 
$
28

 
$
932,773

 
0.00
%
2016
$
999,093

 
$
77,359

 
$
35

 
$
921,769

 
0.00
%