Commitments (Tables)

12 Months Ended

Dec. 31, 2012

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments Under Operating Leases, Net of Amount to be Received Under Sub Leases

Future minimum lease payments under operating leases, net of amounts to be received under sub-leases, as of December 31, 2012 are as follows:

(U.S. Dollars in thousands)
2013	$	3,340
2014		2,992
2015		2,816
2016		2,677
2017		2,620
Thereafter		2,624
Total	$	17,069