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Business Combinations Thermax Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Jul. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Goodwill   $ 218,390 $ 217,970   $ 405,522
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, Liabilities       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