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Acquisitions - Acquisition of Major Energy Companies (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Apr. 15, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 79,556   $ 18,379
National Gas & Electric, LLC | Major Energy Companies      
Business Acquisition [Line Items]      
Cash   $ 17,368  
Property and equipment   14  
Intangible assets - customer relationships & non-compete agreements   24,271  
Other assets - trademarks   4,973  
Non-current deferred tax assets   1,042  
Goodwill   35,137  
Net working capital, net of cash acquired   (6,345)  
Fair value of derivative liabilities   7,260  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 69,200