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Schedule IV - Reinsurance [Disclosure] Schedule IV - Reinsurance (Notes) | 12 Months Ended
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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 | ) |  | —%

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- Definition The entire disclosure for the supplemental schedule of reinsurance information. Reinsurance schedule includes, but is not limited to, the type of insurance, gross amount of premiums, premiums ceded to other entities, premiums assumed from other entities, net amount of premium revenue, and the percentage of the premiums assumed to net premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 + Details
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