Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2023

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)	2023			2022
Cost
Buildings	$	4,103		$	3,867
Plant and equipment		70,252			48,358
Instrumentation		154,192			92,607
Computer software		43,040			40,685
Furniture and fixtures		11,010			7,917
Construction in progress		41,751			4,515
Finance lease assets		23,337			23,276
Property, plant, and equipment, gross		347,685			221,225
Accumulated depreciation		(188,625	)		(162,996	)
Property, plant, and equipment, net	$	159,060		$	58,229