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Acquisitions and Disposals - New Energy Risk narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 24, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill, acquired during period   $ 807,381 $ 25,159
New Energy Risk Inc. [Member]      
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired 63.63%    
Business combination, step acquisition, equity interest in acquiree, percentage 31.16%    
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage 94.79%    
Noncontrolling interest, ownership percentage by noncontrolling owners 5.21%    
Cash consideration $ 8,800    
Business combination, step acquisition, equity interest in acquiree, remeasurement gain 2,500    
Goodwill, acquired during period $ 13,400