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Segment Information - Adjusted Gross Margin (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting [Abstract]                      
Adjusted Gross Profit                 $ 1,391,806 $ 1,521,408 $ 1,500,186
Less adjustments:                      
Selling, general and administrative                 576,568 513,526 510,075
Impairment and related charges                 0 0 81,112
Cost of revenue adjustments:                      
Depreciation and amortization                 340,889 341,653 317,812
Amortization of upfront incentive consideration                 82,935 77,622 67,411
Restructuring and other costs                 0 0 12,604
Stock-based compensation                 27,997 26,591 17,732
Operating income $ 57,637 $ 113,460 $ 81,913 $ 110,407 $ 121,019 $ 136,763 $ 138,833 $ 165,401 $ 363,417 $ 562,016 $ 493,440