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Business Combinations Thermax Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Jul. 01, 2015
Business Acquisition [Line Items]        
Goodwill   $ 219,091 $ 218,390  
Thermax [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       $ 29,687
Business Combination, Consideration Transferred $ 24,197      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents       2,307
Working Capital Adjustment Payment   $ 1,383    
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill       19,332
Goodwill       10,355
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       $ 10,000