Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2021	Mar. 31, 2020	Jun. 30, 2022
Commitments And Contingencies [Abstract]
Allowance against letters of credit	$ 2,400			$ 1,500
Letters of credit cancelled		$ 636	$ 250