Leases (Supplemental Cash Flow Information Related To Leases) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating cash flows from finance leases	$ 10	$ 4	$ 24	$ 10
Operating cash flows from operating leases	1,922	1,941	5,749	6,610
Financing cash flows from finance leases	97	49	239	151
Leased assets obtained in exchange for new finance lease liabilities	379	419	534	637
Leased assets obtained in exchange for new operating lease liabilities	$ 1,580	$ 1,107	$ 4,142	$ 25,326
Weighted-average remaining lease term, Operating leases	3 years 9 months 18 days		3 years 9 months 18 days
Weighted-average remaining lease term, Finance leases	5 years 4 months 24 days		5 years 4 months 24 days
Weighted-average discount rate, Operating leases	4.20%		4.20%
Weighted-average discount rate, Finance leases	4.90%		4.90%