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Segment Information - Adjusted Gross Margin (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting [Abstract]    
Adjusted Gross Profit $ 400,777 $ 388,196
Less adjustments:    
Selling, general and administrative 144,441 133,856
Cost of revenue adjustments:    
Depreciation and amortization 73,697 66,507
Amortization of upfront incentive consideration 16,132 12,337
Stock-based compensation 3,181 4,074
Operating income $ 163,326 $ 171,422