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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 13,186 $ 12,339 $ 11,455
Provision for warranty claims 5,152 5,054 4,538
Warranty claims (3,810) (3,942) (4,210)
Other (62) (265) 556
Balance at end of period $ 14,466 $ 13,186 $ 12,339