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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash provided by (used for) operations    
Net income $ 243,053 $ 520,711
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 63,293 42,240
Stock-based compensation 7,518 5,403
Pension expense 82 212
Deferred income taxes 2,749 19,287
Change in fair value of interest rate swaps 471 (2,460)
Other (1,798) (1,987)
Decrease (increase) in working capital    
Receivables (171,794) (129,993)
Inventories (5,482) (142,936)
Prepaid expenses and other (7,805) (7,602)
Accounts payable and accrued liabilities 124,910 127,935
Pension contributions (268) (794)
Income taxes payable 33,220 4,507
Other 2,069 1,533
Net cash provided by operations 290,218 436,056
Cash provided by (used for) investment    
Expenditures for property and equipment (68,287) (40,808)
Proceeds from sales of assets and other 1,918 2,864
Net cash used for investment (66,369) (37,944)
Cash provided by (used for) financing    
Dividends paid on common stock (132,967) (109,291)
Tax withholding payments on stock-based awards (5,926) (3,930)
Treasury stock purchased (1,539) 0
Other (904) (811)
Net cash used for financing (141,336) (114,032)
Net increase in cash and cash equivalents 82,513 284,080
Balance at beginning of the period 998,344 748,907
Balance at end of the period $ 1,080,857 $ 1,032,987