Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Reconciliation of Product Warranties) (Details)

v3.20.4
Accrued Liabilities (Reconciliation of Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 14,466 $ 13,186 $ 12,339
Provision for warranty claims 3,033 5,152 5,054
Warranty claims (3,128) (3,810) (3,942)
Other 374 (62) (265)
Balance at end of period $ 14,745 $ 14,466 $ 13,186