Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 64,742	$ 70,860
Variable lease cost	15,021	13,780
Short-term lease cost	37,524	20,384
Sublease income	(1,286)	(1,391)
Net lease cost	$ 116,001	$ 103,633