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Business Combinations Thermax Acquisition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Jul. 01, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 218,390   $ 405,522 $ 398,905
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   $ 29,684    
Business Combination, Consideration Transferred $ 24,197      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   2,307    
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill   19,264    
Goodwill   10,420    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 10,000