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Equity Method Investments (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 25, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]        
Payments to acquire   $ 46,745 $ 0  
Equity method investments   46,268   $ 0
SDC        
Schedule of Equity Method Investments [Line Items]        
Ownership 17.00%      
Payments to acquire $ 46,700      
Equity method investments   $ 46,300