Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Reconciliation of Product Warranties) (Details)

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Accrued Liabilities (Reconciliation of Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 14,745 $ 14,466 $ 13,186
Provision for warranty claims 2,179 3,033 5,152
Warranty claims (2,917) (3,128) (3,810)
Other (362) 374 (62)
Balance at end of period $ 13,645 $ 14,745 $ 14,466