Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Useful Lives of Assets

The useful lives of these assets are generally as follows:

	Years
Buildings	25 to 33
Plant and equipment	1 to 10
Instrumentation	3 to 4
Computer software	3 to 7
Furniture and fixtures	4 to 8

Schedule of Property, Plant and Equipment

The assets and related accumulated depreciation are adjusted for property retirements and disposals, with the resulting gain or loss included in earnings. Fully depreciated assets remain in the accounts until retired from service.

	December 31,
(U.S. Dollars, in thousands)	2024			2023
Cost
Buildings	$	3,874		$	4,103
Plant and equipment		76,481			70,252
Instrumentation		176,387			154,192
Computer software		41,396			43,040
Furniture and fixtures		9,832			11,010
Construction in progress		22,693			41,751
Finance lease assets		21,383			23,337
Property, plant, and equipment, gross		352,046			347,685
Accumulated depreciation		(212,242	)		(188,625	)
Property, plant, and equipment, net	$	139,804		$	159,060