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Business Combinations Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 $ (1,623) $ 47 $ (1,622) $ 47
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