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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES      
Net income $ 91,444 $ 195,113 $ 218,363
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 132,575 108,123 83,017
Stock-based compensation expense 9,186 7,881 6,375
Gain on disposition of assets, net (8,199) (9,344) (8,804)
Gain due to benefit plan financing arrangement (1,151)    
Deferred income tax provision 6,899 8,647 19,496
Pension settlement charges   18,286 2,921
Other non-cash adjustments 709 126 647
Decrease (increase) in assets:      
Accounts receivable 48,032 104,574 (157,894)
Income taxes receivable 47,937 (9,866) 16,101
Inventories 2,958 (12,341) (18,413)
Prepaid expenses (1,579) 5,233 (7,980)
Other current assets (1) 311 406
Other non-current assets (2,181) (1,285) 9,306
Increase (decrease) in liabilities:      
Accounts payable 278 (34,519) 35,759
Income taxes payable 171 (224) (157)
Unearned revenue 29,633 15,743  
Accrued payroll and related expenses (5,652) (2,223) 17,864
Pension liabilities   (5,419)  
Accrued insurance expenses 2,602 2,108 (6,897)
Accrued state, local and other taxes (1,227) 165 2,391
Other accrued expenses (6,489) (5,732) (3,703)
Pension and retirement plan liabilities 815 618 (4,589)
Long-term accrued insurance expenses 1,973 3,053 (4,621)
Other long-term liabilities 653 5,735 1,698
Net cash provided by operating activities 349,386 394,763 201,286
INVESTING ACTIVITIES      
Capital expenditures (219,930) (181,005) (139,552)
Proceeds from sale of assets 18,379 18,091 15,837
Purchase of business   (78,798)  
Proceeds from benefit plan financing arrangement 2,380    
Re-investment in benefit plan financing arrangement (2,380)    
Net cash used for investing activities (201,551) (241,712) (123,715)
FINANCING ACTIVITIES      
Payment of dividends (34,433) (34,562) (8,645)
Cash paid for common stock purchased and retired (9,938) (21,088) (918)
Cash paid for finance lease and finance obligations (799) (515) (24,017)
Net cash used for financing activities (45,170) (56,165) (33,580)
Net increase in cash and cash equivalents 102,665 96,886 43,991
Cash and cash equivalents at beginning of period 223,310 126,424 82,433
Cash and cash equivalents at end of period 325,975 223,310 126,424
Supplemental cash flows disclosure:      
Interest paid 170 166 170
Supplemental disclosure of noncash investing activities:      
Capital expenditures included in accounts payable $ 8,199 $ 9,036 $ 9,334