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Segment Information - Adjusted Gross Margin (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting [Abstract]        
Adjusted Gross Profit $ 346,418 $ 377,786 $ 1,069,946 $ 1,156,042
Less adjustments:        
Selling, general and administrative 119,918 130,152 426,014 384,047
Cost of revenue adjustments:        
Depreciation and amortization 85,262 85,552 256,775 254,490
Amortization of upfront incentive consideration 20,851 18,207 59,825 57,324
Stock-based compensation 6,927 7,112 21,552 19,184
Operating income $ 113,460 $ 136,763 $ 305,780 $ 440,997