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Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2017
Oct. 20, 2016
Jan. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Business Acquisition            
Recorded in payables       $ 27,136 $ 18,350  
Recorded in long-term liabilities       5,795 4,019  
Goodwill       61,156 49,314  
D-Flow            
Business Acquisition            
Outstanding common stock acquired (as a percent) 100.00%          
Sales of D-Flow products       $ 1,500    
Cash payment $ 23,200          
Payments anticipated to be made within eighteen months of the purchase date $ 5,100          
Period to make payments from purchase date 18 months          
Recorded in payables           $ 4,100
Recorded in long-term liabilities           $ 1,000
Receivables $ 300          
Inventory 600          
Machinery and equipment 200          
Intangibles 10,900          
Goodwill 11,800          
Liabilities assumed as part of the acquisition $ 600          
Nice Instruments            
Business Acquisition            
Cash payment     $ 200      
Intangibles         700  
Goodwill         1,300  
Total purchase consideration   $ 2,000        
Inventory and equipment         $ 15  
Nice Instruments | Customer technology            
Business Acquisition            
Estimated average useful life         15 years