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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
OPERATING ACTIVITIES    
Net income $ 78,682 $ 154,854
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 97,371 78,716
Stock-based compensation expense 6,987 6,033
Gain on disposition of assets, net (6,342) (7,729)
Gain due to benefit plan financing arrangement (1,151)  
Deferred income tax provision 3,871 7,845
Pension settlement charges   18,286
Other non-cash adjustments 149 42
Decrease (increase) in assets:    
Accounts receivable 49,419 102,591
Income taxes receivable 51,332 (20,486)
Inventories (2,658) (11,506)
Prepaid expenses 6,067 6,437
Other current assets 96 (167)
Other non-current assets (3,419) (2,341)
Increase (decrease) in liabilities:    
Accounts payable 3,167 (31,569)
Income taxes payable (52) (240)
Unearned revenue (15,743)  
Accrued payroll and related expenses (10,426) (5,245)
Accrued insurance expenses 322 3,528
Accrued state, local and other taxes 1,607 1,900
Other accrued expenses (6,050) (4,385)
Pension and retirement plan liabilities 720 (6,696)
Long-term accrued insurance expenses 1,129 2,340
Other long-term liabilities 137 6,934
Net cash provided by operating activities 255,215 299,142
INVESTING ACTIVITIES    
Capital expenditures (179,460) (148,816)
Proceeds from sale of assets 14,127 12,569
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 (165,333) (215,045)
FINANCING ACTIVITIES    
Payment of dividends (25,784) (25,948)
Cash paid for common stock purchased and retired (9,928) (12,445)
Cash paid for finance lease and finance obligations (592) (254)
Net cash used for financing activities (36,304) (38,647)
Net increase in cash and cash equivalents 53,578 45,450
Cash and cash equivalents at beginning of period 223,310 126,424
Cash and cash equivalents at end of period 276,888 171,874
Supplemental cash flows disclosure:    
Income tax (refund) payments, net (32,920) 61,484
Interest paid 127 124
Supplemental disclosure of noncash investing activities:    
Capital expenditures included in accounts payable $ 7,451 $ 9,527