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Business Combinations Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 0 $ 75 $ (1,622) $ 122
Thermax [Member]        
Business Combination, Contingent Consideration Arrangements, Inception Amount Recorded During Reporting Period     1,800  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Business Combination, Contingent Consideration, Liability Beginning Balance     1,923  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     (1,622)  
Business Combination, Contingent Consideration, Liability Ending Balance 301   301  
Thermax [Member] | Minimum [Member]        
Business Acquisition, Contingent Consideration, Potential Cash Payment 0   0  
Thermax [Member] | Maximum [Member]        
Business Acquisition, Contingent Consideration, Potential Cash Payment $ 11,288   $ 11,288