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Schedule IV - Reinsurance [Disclosure] Schedule IV - Reinsurance (Notes)
 12 Months Ended
Dec. 31, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
SCHEDULE IV— REINSURANCE
Years Ended December 31, 2017, 2016 and 2015
Insurance Premiums Written
($ in Thousands)
Gross
Amount
 
Ceded to Other
Companies
 
Assumed from
Other
Companies
 
Net
Amount
 
Percentage of
Amount
Assumed to
Net
Year Ended December 31, 2017
$
(14,313
)
 
$
(2,104
)
 
$
—

 
$
(12,209
)
 
—%
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2016
(53,837
)
 
(8,772
)
 
$
—

 
(45,065
)
 
—%

 
 
 
 
 
 
 
 
 
Year Ended December 31, 2015
(37,572
)
 
(3,001
)
 
—

 
(34,571
)
 
—%