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Property, Plant & Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Abstract]          
Property, plant and equipment $ 181,556   $ 181,556   $ 174,553
Accumulated depreciation (107,179)   (107,179)   (100,501)
Property, plant and equipment — net 74,377   74,377   74,052
Depreciation expense 2,471 $ 2,273 7,414 $ 6,764  
Capital additions in progress $ 5,227   5,227   $ 1,422
Purchase commitments for capital expenditures in progress     $ 3,561 $ 677