Commitments And Contingencies (Supplemental Cash Flow Information Related To Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Operating cash flows from operating leases	$ 19,579	$ 20,864	$ 21,459
Right-of-use assets obtained in exchange for lease obligations: Operating leases	20,291	32,713	11,176
Right-of-use assets and lease obligations derecognized due to lease modifications: Operating leases	$ 1,889	$ 5,176	$ 1,726