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Acquisitions and Disposals - New Energy Risk narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 24, 2015
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill, acquired during period   $ 13,946 $ 807,381 $ 25,159
New Energy Risk Inc.        
Business Acquisition [Line Items]        
Business acquisition, percentage of voting interests acquired 63.63%      
Original ownership percentage 31.16%      
Ownership percentage following additional purchase of shares 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