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Product Warranties (Changes in Warranty Reserve) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Warranties [Abstract]      
Balance at the beginning of the year $ 8,324 $ 9,239 $ 8,742
Current year provision 1,661 2,394 3,209
Reductions for payments, cost of repairs and other (894) (1,812) (1,611)
Adjustments to prior warranties (1,029) (1,497) (1,101)
Balance at the end of the year $ 8,062 $ 8,324 $ 9,239