Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Feb. 02, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Identifiable Assets	$ 1,199,508	$ 1,456,804	$ 1,501,079
Rentals [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	365,358		572,776
Well Services [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	715,738		554,178
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 118,412		$ 374,125