Business Segment and Geographic Information - Revenue and Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Business Segment and Geographic Information
Gross revenue	$ 212,870	$ 200,981	$ 659,583	$ 578,258
Long-lived assets	4,133,061		4,133,061		$ 4,214,233
U.S.
Business Segment and Geographic Information
Gross revenue	136,785	126,599	422,114	368,689
Long-lived assets	4,116,769		4,116,769		4,200,133
International
Business Segment and Geographic Information
Gross revenue	76,085	$ 74,382	237,469	$ 209,569
Long-lived assets	$ 16,292		$ 16,292		$ 14,100