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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash provided by (used for) operations    
Net income $ 520,711 $ 451,712
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 42,240 40,826
Stock-based compensation 5,403 3,503
Pension expense 212 38
Deferred income taxes 19,287 (10,481)
Change in fair value of interest rate swaps (2,460) (999)
Other (1,987) 1,017
Decrease (increase) in working capital    
Receivables (129,993) (219,112)
Inventories (142,936) (225,006)
Prepaid expenses and other (7,602) (7,448)
Accounts payable and accrued liabilities 127,935 248,139
Pension contributions (794) (153)
Income taxes payable 4,507 7,253
Other 1,533 1,890
Net cash provided by operations 436,056 291,179
Cash provided by (used for) investment    
Expenditures for property and equipment (40,808) (31,502)
Proceeds from sales of assets and other 2,864 500
Net cash used for investment (37,944) (31,002)
Cash provided by (used for) financing    
Borrowings of long-term debt, including revolving credit facility 0 28,000
Payments of long-term debt, including revolving credit facility 0 (28,000)
Dividends paid on common stock (109,291) (8,373)
Tax withholding payments on stock-based awards (3,930) (2,729)
Other (811) (690)
Net cash used for financing (114,032) (11,792)
Net increase in cash and cash equivalents 284,080 248,385
Balance at beginning of the period 748,907 405,382
Balance at end of the period $ 1,032,987 $ 653,767