Leases (Components of Lease Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 33,046	$ 21,899
Short-term lease cost	2,272	2,611
Variable lease cost	2,266	1,781
Total lease cost	$ 37,584	$ 26,291