Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues [Abstract]
Total revenues	$ 201,081	$ 244,473	$ 409,715	$ 464,610
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	108,268	120,754	214,907	238,475
Total depreciation, depletion, amortization and accretion	20,868	20,621	41,315	40,760
General and administrative expenses	33,404	31,177	68,379	62,167
Restructuring and transaction expenses	0	0	0	1,983
Other (gains) and losses, net	(614)	47	(1,696)	(1,351)
Income from operations	39,155	71,874	86,810	122,576
Other income (expense):
Interest income , net	5,760	6,513	12,600	11,952
Other expense, net	(2,082)	(1,836)	(3,895)	(3,988)
Income from continuing operations before income taxes	42,833	76,551	95,515	130,540
Income tax expense	(13,370)	(9,147)	(28,157)	(33,212)
Net income from continuing operations	29,463	67,404	67,358	97,328
Income (loss) from discontinued operations, net of tax	1,896	(9)	1,896	280
Net income	$ 31,359	$ 67,395	$ 69,254	$ 97,608
Income per share - basic:
Net income from continuing operations	$ 1.46	$ 3.35	$ 3.34	$ 4.84
Income (loss) from discontinued operations, net of tax	0.09	0	0.09	0.01
Net income	1.55	3.35	3.43	4.85
Income per share - diluted:
Net income from continuing operations	1.46	3.35	3.34	4.83
Income (loss) from discontinued operations, net of tax	0.09	0	0.09	0.02
Net income	$ 1.55	$ 3.35	$ 3.43	$ 4.85
Weighted-average shares outstanding - basic	20,172	20,126	20,167	20,116
Weighted-average shares outstanding - diluted	20,183	20,143	20,181	20,136
Services [Member]
Revenues [Abstract]
Total revenues	$ 81,687	$ 106,130	$ 155,024	$ 199,420
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	51,652	58,940	98,141	124,019
Total depreciation, depletion, amortization and accretion	6,730	7,704	12,482	14,999
Rentals [Member]
Revenues [Abstract]
Total revenues	76,331	85,361	157,421	170,971
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	32,321	30,314	63,924	59,362
Total depreciation, depletion, amortization and accretion	6,315	6,165	12,674	12,859
Product Sales [Member]
Revenues [Abstract]
Total revenues	43,063	52,982	97,270	94,219
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	24,295	31,500	52,842	55,094
Total depreciation, depletion, amortization and accretion	$ 7,823	$ 6,752	$ 16,159	$ 12,902