Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350,000
Debt Instrument, Interest Rate, Effective Percentage	8.38%
Long-term Debt	1,219,310	963,178
Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	934,812	909,186
Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, Segregated Account, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	40,919	39,797
Ambac Assurance Corporation [Member] | 5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	243,579	14,195
Variable Interest Entity [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 13,159,174	$ 14,091,753