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Acquisition and Disposals - New Energy Risk narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 24, 2015
Jun. 30, 2016
Business Acquisition [Line Items]    
Goodwill acquired during the period   $ 14,084
New Energy Risk Inc.    
Business Acquisition [Line Items]    
Percentage of voting interests acquired 63.63%  
Original ownership percentage 31.16%  
Ownership percentage following additional purchase of shares 94.79%  
Ownership percentage held by noncontrolling interest 5.21%  
Cash consideration $ 8,800  
Gain on fair value adjustment 2,500  
Goodwill acquired during the period $ 13,400