Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Financial guarantee exposure summary

Financial Guarantee Exposure Summary (U.S. dollars in thousands except number of contracts and term to maturity)	March 31, 2013		December 31, 2012
Opening number of financial guarantee contracts	4		4
Number of financial guarantee contracts matured, prepaid or commuted during the period	—		—
Closing number of financial guarantee contracts	4		4
Principal outstanding	$	115,464	$	115,464
Interest outstanding	$	—	$	—
Aggregate exposure outstanding	$	115,464	$	115,464
Total gross claim liability recorded	$	1,399	$	1,399
Total unearned premiums and fees recorded	$	243	$	279
Weighted average contractual term to maturity in years	25.2		25.4