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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash provided by (used for) operations    
Net income $ 302,600 $ 149,156
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 20,993 19,950
Stock-based compensation 2,392 2,092
Pension expense 171 19
Deferred income taxes (729) (2,244)
Change in fair value of interest rate swaps (2,066) (1,024)
Other (2,412) 4
Decrease (increase) in working capital    
Receivables (218,018) (161,833)
Inventories (143,997) (108,220)
Prepaid expenses and other (3,227) (2,444)
Accounts payable and accrued liabilities 147,425 125,064
Pension contributions (655) (78)
Income taxes payable 95,352 52,565
Other 1,116 (756)
Net cash provided by operations 198,945 72,251
Cash provided by (used for) investment    
Expenditures for property and equipment (17,448) (13,301)
Proceeds from sales of assets and other 2,581 136
Net cash used for investment (14,867) (13,165)
Cash provided by (used for) financing    
Dividends paid on common stock (5,939) (4,440)
Tax withholding payments on stock-based awards (3,930) (2,729)
Other (395) (317)
Net cash used for financing (10,264) (7,486)
Net increase in cash and cash equivalents 173,814 51,600
Balance at beginning of the period 748,907 405,382
Balance at end of the period $ 922,721 $ 456,982