Segment Information - Adjusted Operating Income (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 Operating Income (Loss)									$ 513,408	$ 701,432	$ 706,149
Less adjustments:
Joint venture equity income									2,044	2,556	2,580
Impairment and related charges									0	0	81,112
Acquisition-related amortization									64,604	68,008	95,860
Restructuring and other costs									0	0	23,975
Acquisition-related costs									41,037	3,266	0
Litigation (reimbursements) costs									(24,579)	8,323	(35,507)
Stock-based compensation									66,885	57,263	44,689
Operating income	$ 57,637	$ 113,460	$ 81,913	$ 110,407	$ 121,019	$ 136,763	$ 138,833	$ 165,401	$ 363,417	$ 562,016	$ 493,440