Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues [Abstract]
Total revenues	$ 197,307	$ 210,385	$ 607,022	$ 674,995
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	109,399	109,845	324,306	348,320
Total depreciation, depletion, amortization and accretion	21,077	20,490	62,392	61,250
General and administrative expenses	33,458	30,089	101,837	92,256
Restructuring and transaction expenses	5,891	0	5,891	1,983
Other gains, net	(133)	(4,073)	(1,829)	(5,424)
Income from operations	27,615	54,034	114,425	176,610
Other income (expense):
Interest income , net	5,032	6,629	17,632	18,581
Loss on Blue Chip Swap securities	(5,113)	(12,120)	(5,113)	(12,120)
Other income (expense), net	979	(4,520)	(2,916)	(8,508)
Income from continuing operations before income taxes	28,513	44,023	124,028	174,563
Income tax expense	(6,597)	(11,403)	(34,754)	(44,615)
Net income from continuing operations	21,916	32,620	89,274	129,948
Income from discontinued operations, net of tax	0	128	1,896	408
Net income	$ 21,916	$ 32,748	$ 91,170	$ 130,356
Income per share - basic:
Net income from continuing operations	$ 1.09	$ 1.62	$ 4.43	$ 6.46
Income from discontinued operations, net of tax	0	0.01	0.09	0.02
Net income	1.09	1.63	4.52	6.48
Income per share - diluted:
Net income from continuing operations	1.09	1.62	4.42	6.45
Income from discontinued operations, net of tax	0	0	0.1	0.02
Net income	$ 1.09	$ 1.62	$ 4.52	$ 6.47
Weighted-average shares outstanding - basic	20,177	20,136	20,170	20,123
Weighted-average shares outstanding - diluted	20,186	20,159	20,182	20,144
Services [Member]
Revenues [Abstract]
Total revenues	$ 82,343	$ 80,956	$ 237,367	$ 280,376
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	56,084	57,202	154,225	181,221
Total depreciation, depletion, amortization and accretion	6,911	6,684	19,393	21,683
Rentals [Member]
Revenues [Abstract]
Total revenues	77,131	89,348	234,552	260,319
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	30,640	29,580	94,564	88,942
Total depreciation, depletion, amortization and accretion	6,489	7,272	19,163	20,131
Product Sales [Member]
Revenues [Abstract]
Total revenues	37,833	40,081	135,103	134,300
Costs and expenses:
Total cost of revenues (exclusive of items shown separately below)	22,675	23,063	75,517	78,157
Total depreciation, depletion, amortization and accretion	$ 7,677	$ 6,534	$ 23,836	$ 19,436