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Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting 50.00%    
Allowance for Doubtful Accounts      
Percentage reserved for accounts receivable due from customers in deteriorating financial condition 100.00%    
Fair Value of Financial Instruments      
United States Treasury securities and money market funds included in cash equivalents $ 5,293 $ 2,832  
Contingent Consideration for acquisition $ 1,314 $ 0 $ 0
Minimum | Software      
Depreciation and Amortization      
Estimated useful life 3 years    
Minimum | Machinery and equipment      
Depreciation and Amortization      
Estimated useful life 3 years    
Minimum | Buildings and site improvements      
Depreciation and Amortization      
Estimated useful life 15 years    
Maximum      
Revenue Recognition      
Service sales as a percentage of net sales 1.00%    
Maximum | Software      
Depreciation and Amortization      
Estimated useful life 5 years    
Maximum | Machinery and equipment      
Depreciation and Amortization      
Estimated useful life 10 years    
Maximum | Buildings and site improvements      
Depreciation and Amortization      
Estimated useful life 45 years