Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventory Disclosure [Abstract]

Schedule of Inventories

	December 31,
(U.S. Dollars, in thousands)	2012		2011
	(Restated)		(Restated)
Raw materials	$	7,623	$	9,894
Work-in-process		7,886		5,606
Finished products		28,308		27,142
Field inventory		22,629		23,237
Consignment inventory		6,155		6,981
Deferred cost of sales		10,772		8,668
	$	83,373	$	81,528