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Product Warranties (Changes in Warranty Reserve) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Product Warranties [Abstract]    
Balance at the beginning of the year $ 5,216 $ 8,388
Current year provision 200 451
Reductions for payments, costs of repairs and other (1,358) (1,756)
Adjustments to prior warranties (1,525) (1,867)
Balance at the end of the year $ 2,533 $ 5,216