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Business Combinations Thermax Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Jul. 01, 2015
Business Acquisition [Line Items]      
Goodwill $ 219,258 $ 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     $ 29,684
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     19,264
Goodwill     10,420
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 10,000