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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash provided by (used for) operations    
Net income $ 386,121 $ 740,298
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 95,516 71,213
Stock-based compensation 11,518 8,690
Pension expense 122 253
Deferred income taxes 4,351 45,365
Change in fair value of interest rate swaps 798 (3,594)
Other (1,877) (830)
Decrease (increase) in working capital, net of acquisitions    
Receivables (158,756) (51,027)
Inventories 14,145 (83,539)
Prepaid expenses and other (6,604) (5,901)
Accounts payable and accrued liabilities 152,303 78,444
Pension contributions (403) (922)
Income taxes payable 23,664 14,970
Other 231 705
Net cash provided by operations 521,129 814,125
Cash provided by (used for) investment    
Expenditures for property and equipment (99,251) (61,835)
Acquisitions of businesses and facilities 0 (516,881)
Proceeds from sales of assets and other 2,450 3,094
Net cash used for investment (96,801) (575,622)
Cash provided by (used for) financing    
Dividends paid on common stock (140,885) (114,025)
Tax withholding payments on stock-based awards (5,926) (3,930)
Treasury stock purchased (1,539) 0
Payments of deferred financing costs 0 (1,170)
Other (1,359) (1,221)
Net cash used for financing (149,709) (120,346)
Net increase in cash and cash equivalents 274,619 118,157
Balance at beginning of the period 998,344 748,907
Balance at end of the period $ 1,272,963 $ 867,064