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Business Combinations Revenue and Earnings Attributed to Business Combination (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]      
Revenue, Net $ 607,221   $ 477,592
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (145,270)   16,014
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 85,833  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ (29,753)  
Comverge [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Pro Forma Revenue     491,762
Business Acquisition, Pro Forma Net Income (Loss)     $ 15,107