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Product Warranties (Changes in Warranty Reserve) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product Warranties [Abstract]    
Balance at the beginning of the year $ 8,062 $ 8,324
Current year provision 1,324 1,661
Reductions for payments, cost of repairs and other (526) (894)
Adjustments to prior warranties 449 (1,029)
Balance at the end of the year $ 9,309 $ 8,062