Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 16,106	$ 18,056	$ 32,429	$ 36,189
Variable lease cost	3,840	3,222	7,052	6,297
Short-term lease cost	9,992	4,804	17,166	8,962
Sublease income	(328)	(373)	(607)	(726)
Net lease cost	$ 29,610	$ 25,709	$ 56,040	$ 50,722