Notes Payable and Debt and Financing Arrangements (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Letter of Credit Summary

The Company's letter of credit facilities and revolving credit facilities at March 31, 2013 and December 31, 2012 were as follows:

Letter of Credit Summary: (U.S. dollars in thousands except percentages)	March 31, 2013 (1)			December 31, 2012 (1)
Revolving credit facility (2)	$	1,000,000		$	1,000,000
Available letter of credit facilities - commitments (3)	$	4,000,000		$	4,000,000
Available letter of credit facilities - in use	$	1,769,005		$	1,757,250
Collateralized by certain assets of the Company’s investment portfolio	93.4		%	93.3		%

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(1) At March 31, 2013 and December 31, 2012, there were five available letter of credit facilities.

(2) At March 31, 2013 and December 31, 2012, the revolving credit facility was unutilized.

(3) The Company has the option to increase the size of the March 2011 Credit Agreement by an additional $500 million and the size of the facilities under the December 2011 Credit Agreements by an additional $500 million across both such facilities.