Inventories (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories, net of reserves, were as follows:

(U.S. Dollars, in thousands)	March 31, 2014		December 31, 2013
Raw materials	$	4,872	$	6,515
Work-in-process		7,412		6,606
Finished products		40,758		36,898
Field inventory		28,787		29,360
Consignment inventory		4,354		3,916
Deferred cost of sales		6,570		7,282
Total Inventory	$	92,753	$	90,577