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Business Combinations Hetsco Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Jan. 13, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 228,352   $ 217,970
Hetsco [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired   100.00%  
Business Combination, Consideration Transferred $ 23,162    
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill   $ 13,042  
Goodwill   10,120  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 8,400