Notes Payable and Debt and Financing Arrangements (Tables)

6 Months Ended

Jun. 30, 2012

Schedule of Line of Credit Facilities [Table Text Block]

Letter of Credit Summary:	June 30,		December 31,
(U.S. dollars in thousands except percentages)	2012 (1)		2011 (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	$	1,728,948	$	1,871,192
Collateralized by certain assets of the Company's investment portfolio		93.2%		93.8%

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(1) At June 30, 2012 and December 31, 2011, there were five available letter of credit facilities.

(2) At June 30, 2012 and December 31, 2011, 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.