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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net earnings $ 97,939 $ 46,192
Adjustments to reconcile net earnings to net cash provided by operations:    
Depreciation and amortization 102,806 100,079
Provision for deferred income taxes 30,238 15,335
Amortization of share-based compensation 8,912 8,555
Amortization of major maintenance costs 14,043 14,405
Other (3,111) (6,412)
Decrease in cash flows resulting from changes in operating assets and liabilities, net (22,878) (82,510)
Net cash provided by operating activities 227,949 95,644
Cash flows from investing activities:    
Capital expenditures (171,245) (79,059)
Acquisitions of businesses 0 (3,900)
Proceeds from disposition of assets 20,529 23,311
Net cash used in investing activities (150,716) (59,648)
Cash flows from financing activities:    
Borrowings on bank credit facilities, net 31,155 2,272
Borrowings on long-term debt 240,000 0
Payments on long-term debt (350,000) (30,000)
Payment of debt issuance costs (1,236) 0
Proceeds from exercise of stock options 118 3,885
Payments related to tax withholding for share-based compensation (3,595) (3,192)
Treasury stock purchases (37,600) (18,085)
Return of investment to noncontrolling interest and other (49) (585)
Net cash used in financing activities (121,207) (45,705)
Decrease in cash and cash equivalents (43,974) (9,709)
Cash and cash equivalents, beginning of year 80,577 34,813
Cash and cash equivalents, end of period 36,603 25,104
Cash paid (received) during the period:    
Interest paid 24,553 20,161
Income taxes paid (refunded), net (67,921) 1,190
Operating cash outflow from operating leases 22,769 22,287
Non-cash investing activity:    
Capital expenditures included in accounts payable (5,064) (3,655)
Right-of-use assets obtained in exchange for lease obligations $ 20,838 $ 10,290