Leases, Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 43,810	$ 39,064
Variable lease cost	1,550	2,326
Short-term lease cost	25,387	31,340
Sublease income	(1,143)	(420)
Total lease cost	$ 69,604	$ 72,310