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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash provided by (used for) operations    
Net income $ 451,712 $ 45,786
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 40,826 56,295
Stock-based compensation 3,503 3,345
Pension expense 38 1,023
Deferred income taxes (10,481) (1,501)
Change in fair value of interest rate swaps (999) 2,828
Loss on curtailment of facility (excluding severance) 0 1,476
Other 1,017 164
Decrease (increase) in working capital    
Receivables (219,112) (129,532)
Inventories (225,006) 41,102
Prepaid expenses and other (7,448) (6,989)
Accounts payable and accrued liabilities 248,139 95,505
Pension contributions (153) (1,062)
Income taxes payable 7,253 8,616
Other 1,890 1,220
Net cash provided by operations 291,179 118,276
Cash provided by (used for) investment    
Expenditures for property and equipment (31,502) (28,849)
Proceeds from sales of assets and other 500 406
Net cash used for investment (31,002) (28,443)
Cash provided by (used for) financing    
Borrowings of long-term debt, including revolving credit facility 28,000 0
Payments of long-term debt, including revolving credit facility (28,000) 0
Dividends paid on common stock (8,373) (8,562)
Tax withholding payments on stock-based awards (2,729) (3,309)
Other (690) (1,763)
Net cash used for financing (11,792) (13,634)
Net increase in cash and cash equivalents 248,385 76,199
Balance at beginning of the period 405,382 285,237
Balance at end of the period $ 653,767 $ 361,436