Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 16,132	$ 18,002	$ 48,561	$ 54,191
Variable lease cost	4,204	3,630	11,256	9,927
Short-term lease cost	12,923	5,587	30,089	14,549
Sublease income	(344)	(351)	(951)	(1,077)
Net lease cost	$ 32,915	$ 26,868	$ 88,955	$ 77,590