Business Segment and Geographic Information - Revenue and Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Segment and Geographic Information
Gross revenue	$ 212,107	$ 190,485	$ 446,713	$ 377,277
Long-lived assets	4,158,436		4,158,436		$ 4,214,233
U.S.
Business Segment and Geographic Information
Gross revenue	140,073	122,693	285,329	242,090
Long-lived assets	4,145,763		4,145,763		4,200,133
International
Business Segment and Geographic Information
Gross revenue	72,034	$ 67,792	161,384	$ 135,187
Long-lived assets	$ 12,673		$ 12,673		$ 14,100