Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Guarantee_contracts	Mar. 31, 2015	Dec. 31, 2015 USD ($)
Guarantor Obligations [Line Items]
Schedule of Insured Financial Obligations with Credit Deterioration, Insured Contractual Payments Outstanding	$ 80,800
Total gross claim liability recorded	$ 0		$ 0
Financial Guarantee Insurance Contracts Outstanding Weighted Average Contract Period	23 years 11 months 12 days	24 years 2 months 12 days
Financial Guarantee Related to Securities Including Some Issued By European Financials [Member]
Guarantor Obligations [Line Items]
Number Of Financial Guarantee Contracts | Guarantee_contracts	2