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Business Combinations Thermax Acquisition (Details) - USD ($)
3 Months Ended
Sep. 30, 2015
Jul. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 414,121,000   $ 405,522,000
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   $ 29,684,000  
Business Combination, Consideration Transferred $ 24,197,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   2,307,000  
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill   19,264,000  
Goodwill   10,420,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 10,000,000