Long-Term Debt Long-Term Debt (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350,000
Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Percentage of debt instrument	5.10%	5.10%
Debt instrument due	2020	2020
Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, Segregated Account, Due 2020 [Member]
Debt Instrument [Line Items]
Percentage of debt instrument	5.10%	5.10%
Debt instrument due	2020	2020
Ambac Assurance Corporation [Member] | 5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member]
Debt Instrument [Line Items]
Percentage of debt instrument	5.10%	5.10%
Debt instrument due	2020	2020
Variable Interest Entity [Member]
Debt Instrument [Line Items]
Percentage of debt instrument		6.65%