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Acquisitions Acquisitions (Schedule of Consideration Transferred) (Details) - Aquilent - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2017
Business Acquisition [Line Items]      
Cash purchase price paid to Aquilent shareholders $ 250,000    
Working capital and other closing adjustments (1,729)    
Acquired cash on hand 2,998    
Acquisition-related compensation expense (1,291)    
Acquisition-related contingent consideration 3,576 $ 3,600 $ 3,600
Total purchase consideration transferred at closing $ 253,554