Leases (Supplemental Cash Flow Information Related To Leases) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows for finance leases	$ 40	$ 86
Operating cash flows for operating leases	16,666	10,190
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 32,956	$ 179