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Business Combinations Thermax Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jul. 01, 2015
Business Acquisition [Line Items]        
Goodwill   $ 218,990 $ 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
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
Thermax [Member]        
Business Acquisition [Line Items]        
Working Capital Adjustment Payment   $ 1,383