Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 Guarantee_contracts	Mar. 31, 2013 Guarantee_contracts	Dec. 31, 2013 Guarantee_contracts
Guarantor Obligations [Line Items]
Opening number of financial guarantee contracts	3	4	4
Number of financial guarantee contracts matured, prepaid or commuted during the period	0		(1)
Closing number of financial guarantee contracts	3		3
Principal outstanding	$ 108,255		$ 108,255
Interest outstanding	0		0
Aggregate exposure outstanding	108,255		108,255
Total gross claim liability recorded	0	0
Total unearned premiums and fees recorded	$ 97	$ 134
Financial Guarantee Insurance Contracts Outstanding Weighted Average Contract Period	25 years 9 months 18 days	26 years 0 months 0 days
Financial Guarantee Related to Securities Including Some Issued By European Financials [Member]
Guarantor Obligations [Line Items]
Closing number of financial guarantee contracts	3