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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
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition          
Recorded in payables       $ 23,891 $ 18,350
Recorded in long-term liabilities       5,813 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       700  
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