Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease, Cost [Abstract]
Operating lease cost	$ 14,336	$ 16,132	$ 45,391	$ 48,561
Variable lease cost	4,298	4,204	11,417	11,256
Short-term lease cost	6,258	12,923	13,233	30,089
Sublease income	(289)	(344)	(967)	(951)
Net lease cost	$ 24,603	$ 32,915	$ 69,074	$ 88,955