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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 13, 2020
Jan. 15, 2020
Aug. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]                
Goodwill       $ 382,427   $ 382,427   $ 329,705
Total acquisition-related costs       16 $ 604 2,198 $ 608  
Delta Separations                
Business Acquisition [Line Items]                
Aggregate consideration for acquisition $ 47,100              
Goodwill $ 32,151              
Thermo Energy Systems                
Business Acquisition [Line Items]                
Aggregate consideration for acquisition   $ 7,300            
Goodwill   $ 19,459            
Apeks                
Business Acquisition [Line Items]                
Aggregate consideration for acquisition     $ 12,600          
Goodwill     $ 6,436          
Selling, general and administrative costs                
Business Acquisition [Line Items]                
Total acquisition-related costs       $ 16 $ 470 $ 1,564 $ 474