CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenue, Product and Service [Extensible Enumeration]	Service [Member]	Service [Member]	Service [Member]
REVENUE - Service revenue	$ 1,269,158	$ 1,444,286	$ 1,630,399
COSTS AND EXPENSES:
Cost of services (exclusive of depreciation and amortization)	968,175	1,065,514	1,131,801
General and administrative expenses (inclusive of stock‑based compensation)	107,558	114,323	114,354
Depreciation and amortization	174,896	224,109	219,608
Property and equipment impairment expense	0	188,601	0
Goodwill impairment expense	0	23,624	0
Loss (gain) on disposal of assets and businesses, net	12,179	(4,925)	34,293
Total costs and expenses	1,262,808	1,611,246	1,500,056
OPERATING INCOME (LOSS)	6,350	(166,960)	130,343
OTHER INCOME (EXPENSE):
Interest expense	(8,238)	(7,815)	(5,308)
Other income (expense), net	9,709	5,531	(9,533)
Total other income (expense), net	1,471	(2,284)	(14,841)
INCOME (LOSS) BEFORE INCOME TAXES	7,821	(169,244)	115,502
INCOME TAX (EXPENSE) BENEFIT	(6,997)	31,385	(29,868)
NET INCOME (LOSS)	$ 824	$ (137,859)	$ 85,634
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.01	$ (1.31)	$ 0.76
Diluted (in dollars per share)	$ 0.01	$ (1.31)	$ 0.76
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	103,838	105,469	113,004
Diluted (in shares)	105,398	105,469	113,416