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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2021
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)

 

2021

 

 

2020

 

Cost

 

 

 

 

 

 

 

 

Buildings

 

$

3,925

 

 

$

4,096

 

Plant and equipment

 

 

50,275

 

 

 

50,159

 

Instrumentation

 

 

100,515

 

 

 

93,252

 

Computer software

 

 

53,200

 

 

 

52,565

 

Furniture and fixtures

 

 

8,307

 

 

 

8,024

 

Construction in progress

 

 

2,597

 

 

 

1,628

 

Finance lease assets

 

 

23,397

 

 

 

23,337

 

Property, plant, and equipment, gross

 

 

242,216

 

 

 

233,061

 

Accumulated depreciation

 

 

(182,964

)

 

 

(169,448

)

Property, plant, and equipment, net

 

$

59,252

 

 

$

63,613