Business Segment Information - Net Revenues and Long-Lived Assets, Related To Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Geographic Information [Abstract]
Net revenues	$ 804,660	$ 850,176	$ 844,738	$ 867,787	$ 919,141	$ 812,150	$ 802,313	$ 764,917	$ 3,367,361	$ 3,298,521	$ 3,028,779
Long-lived assets	3,318,791				3,360,179				3,318,791	3,360,179
United States
Geographic Information [Abstract]
Net revenues									1,940,267	1,958,844	1,901,571
Long-lived assets	3,262,722				3,313,958				3,262,722	3,313,958
International
Geographic Information [Abstract]
Net revenues									1,427,094	1,339,677	$ 1,127,208
Long-lived assets	$ 56,069				$ 46,221				$ 56,069	$ 46,221