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Segment Information - Adjustment Operating Income (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 Operating Income $ 133,074 $ 173,973 $ 415,789 $ 543,555
Less adjustments:        
Joint venture equity income 1,027 333 1,973 2,455
Acquisition-related amortization 15,976 16,407 47,971 51,585
Acquisition-related costs 9,696 0 30,337 0
Litigation costs, net (24,179) 5,225 (21,355) 7,073
Stock-based compensation 17,094 15,245 51,083 41,445
Operating income $ 113,460 $ 136,763 $ 305,780 $ 440,997