Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Insurance [Abstract]
Loss Reserves Ceded To Reinsurers	$ 74,519	$ 100,355
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 4,789	$ 139	$ (517)