Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Identifiable Assets	$ 1,287,215	$ 1,199,508
Rentals [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	526,759	379,453
Well Services [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	607,840	636,256
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 152,616	$ 183,799