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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (7,948) $ (7,055)
Adjustments to reconcile net loss to net cash flows provided by operating activities:    
Depreciation and amortization 34,340 36,404
Amortization of intangibles from acquisitions 1,980 3,247
Provision for doubtful accounts 1,322 1,378
Amortization of debt discount and debt issuance costs 625 569
Gain on disposition of assets and contingent consideration (493) (167)
Stock-based compensation 1,909 1,778
Deferred income taxes (2,181) (1,953)
Loss on pension settlement   369
Gain on investments (170) (315)
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:    
Accounts receivable 2,183 3,573
Customer receivable 254 745
Prepaid income taxes   679
Accrued taxes 3,966 6,953
Materials and supplies, prepayments, and other current assets (626) (3,503)
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities (9,624) (24,548)
Other assets 340 141
Other liabilities (2,701) (2,283)
Net cash provided by operating activities 23,176 16,012
Cash flows from investing activities:    
Capital expenditures (36,016) (50,598)
Government capital programs - Amounts disbursed (13,473) (2,127)
Government capital programs - Amounts received 10,546 593
Purchases of strategic investments   (630)
Purchase of intangible assets (573)  
Purchase of investments - employee benefit plan (25)  
Proceeds from investments - employee benefit plan 201  
Proceeds from sale of assets 3,655  
Net cash used in investing activities (35,685) (52,762)
Cash flows from financing activities:    
Dividends paid on common stock (3,701) (3,310)
Payment of debt issuance costs (72) (119)
Finance lease payments (443) (249)
Term loan - repayments (3,801) (1,171)
Revolving credit facility - borrowings 46,000 57,553
Revolving credit facility - repayments (18,302) (14,000)
Proceeds from customer receivable credit facility 3,700 4,300
Repayment of customer receivable credit facility (1,804) (1,570)
Purchases of common stock - stock- based compensation (1,896) (1,433)
Purchases of common stock - share repurchase plan (121) (1,407)
Repurchases of noncontrolling interests   (595)
Net cash provided by financing activities 19,560 37,999
Net change in cash, cash equivalents, and restricted cash 7,051 1,249
Total cash, cash equivalents, and restricted cash, beginning of period 62,167 59,728
Total cash, cash equivalents, and restricted cash, end of period 69,218 60,977
Supplemental cash flow information:    
Interest paid 10,291 6,711
Taxes paid 748 29
Dividends declared, not paid 3,720 3,315
Noncash investing activity:    
Amounts accrued for reimbursable capital expenditures from government capital programs 33,446 1,435
Amounts accrued for non-reimbursable capital expenditures $ 14,032 $ 14,773