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Acquisition (Schedule of Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Apr. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 45,684   $ 44,065 $ 45,142
Schaffner Manufacturing Company Inc.        
Business Acquisition [Line Items]        
Accounts receivable   $ 2,415    
Inventories   3,334    
Other current assets   18    
Property, plant and equipment   2,299    
Right-of-use operating lease assets   222    
Goodwill   2,078    
Other intangible assets   2,670    
Current liabilities   (1,911)    
Other long-term liabilities   (125)    
Total purchase price   $ 11,000