CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ (11,387)	$ (7,948)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization	34,527	34,340
Amortization of intangibles from acquisitions	1,226	1,980
Provision for doubtful accounts	1,854	1,322
Amortization of debt issuance costs	716	625
(Gain) loss on disposition of assets and transfers	750	(493)
Stock-based compensation	1,905	1,909
Deferred income taxes	(2,520)	(2,181)
(Gain) loss on investments	4	(170)
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:
Accounts receivable and government grant receivables	(2,440)	2,183
Customer receivable	1,015	254
Accrued taxes	2,223	3,966
Materials and supplies, prepayments, and other current assets	6,004	(626)
Accounts payable and accrued liabilities and advance payments and deposits	2,567	(9,624)
Other assets	1,501	340
Other liabilities	(2,040)	(2,701)
Net cash provided by operating activities	35,905	23,176
Cash flows from investing activities:
Capital expenditures	(20,832)	(36,016)
Government capital programs - Amounts disbursed	(22,445)	(13,473)
Government capital programs - Amounts received	17,281	10,546
Purchase of intangible assets		(573)
Purchase of investments - employee benefit plan	(14)	(25)
Proceeds from investments - employee benefit plan	729	201
Proceeds from sale of assets	141	3,655
Net cash used in investing activities	(25,140)	(35,685)
Cash flows from financing activities:
Dividends paid on common stock	(3,627)	(3,701)
Payment of debt issuance costs	(172)	(72)
Finance lease payments	(494)	(443)
Term loan - repayments	(1,653)	(3,801)
Revolving credit facility - borrowings	13,000	46,000
Revolving credit facility - repayments	(7,000)	(18,302)
Proceeds from customer receivable credit facility		3,700
Repayment of customer receivable credit facility	(2,030)	(1,804)
Purchases of common stock - stock- based compensation	(730)	(1,896)
Purchases of common stock - share repurchase plan		(121)
Repurchases of noncontrolling interests	(44)
Net cash (used in) provided by financing activities	(2,750)	19,560
Net change in cash, cash equivalents, and restricted cash	8,015	7,051
Total cash, cash equivalents, and restricted cash, beginning of period	89,244	62,167
Total cash, cash equivalents, and restricted cash, end of period	97,259	69,218
Supplemental cash flow information:
Interest paid	10,366	10,291
Taxes paid	1,053	748
Dividends declared, not paid	3,652	3,720
Noncash investing activity:
Amounts accrued for reimbursable capital expenditures from government capital programs	22,191	33,446
Amounts accrued for non-reimbursable capital expenditures	$ 13,970	$ 14,032