Leases (Schedule of Lease Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease costs	$ 32,862	$ 32,358
Short-term lease costs	472	820
Variable lease costs	(11)	8
Sublease income	(2,106)	(2,765)
Net lease costs	$ 31,217	$ 30,421