Segment Information (Schedule Of Capital Expenditures, By Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital Expenditures		$ 103,722	$ 113,276	$ 65,389
Drilling Products And Services [Member]
Segment Reporting Information [Line Items]
Capital Expenditures		63,252	46,649	27,219
Onshore Completion And Workover Services [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	[1]	5,830	39,699	15,871
Pumpco capital expenditures		36,700	108,100	99,500
Production Services [Member]
Segment Reporting Information [Line Items]
Capital Expenditures		17,009	8,651	7,860
Technical Solutions [Member]
Segment Reporting Information [Line Items]
Capital Expenditures		11,377	16,221	13,296
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Capital Expenditures		$ 6,254	$ 2,056	$ 1,143

[1] Excludes capital expenditures related to Pumpco of $36.7 million, $108.1 million and $99.5 million for the years ended December 31, 2019, 2018 and 2017, respectively.