Revenue Recognition (Schedule Of Breakout Of The Company's Derived Revenue And Other Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue Recognition [Abstract]
Revenue from contracts with customers	$ 111,122	$ 92,185	$ 214,224	$ 164,599
Interest income	108		125
Cost recovery income			1,938	655
Total revenue	$ 111,122	$ 92,185	$ 216,162	$ 165,254