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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net income $ 169,044 $ 102,430
Discontinued operations, net of tax (62,464) (2,098)
Income from continuing operations 231,508 104,528
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 105,730 106,779
Deferred income taxes 55,478 2,439
Provision for credit losses 5,862 2,485
Amortization of debt issuance costs 792 481
Employee stock-based compensation costs 1,740 4,713
Pension and postretirement benefit plan net periodic benefit credit (2,775) (3,658)
Unrealized Gain (Loss) on investment in Knife River (140,020) 0
Unrealized (gains) losses on investments (4,885) 10,579
Gains on sales of assets (4,887) (2,935)
Changes in current assets and liabilities, net of acquisitions:    
Receivables 124,306 (27,093)
Inventories 1,427 (4,741)
Other current assets (27,614) 18,345
Accounts payable (137,308) 27,113
Other current liabilities 19,090 34,858
Pension and postretirement benefit plan contributions (17) (54)
Other noncurrent changes 1,606 (12,449)
Net cash provided by continuing operations 230,033 261,390
Net cash used in discontinued operations (156,932) (142,282)
Net cash provided by operating activities 73,101 119,108
Investing activities:    
Capital expenditures (232,137) (209,891)
Acquisitions, net of cash acquired 0 0
Net proceeds from sale or disposition of property and other 13,532 30
Investments (2,974) (3,072)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (221,579) (212,933)
Cash Provided by (Used in) Investing Activities, Discontinued Operations (55,012) (78,092)
Net cash used in investing activities (276,591) (291,025)
Financing activities:    
Issuance of short-term borrowings 500,000 0
Repayment of short-term borrowings (193,500) 0
Issuance of long-term debt 389,500 179,407
Repayment of long-term debt (506,191) (147,397)
Debt issuance costs (1,864) (320)
Net proceeds from issuance of common stock 0 (149)
Dividends paid (90,552) (88,457)
Repurchase of common stock (4,811) (7,399)
Tax withholding on stock-based compensation (3,040) (4,905)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 89,542 (69,220)
Cash Provided by (Used in) Financing Activities, Discontinued Operations 94,300 254,028
Net Cash Provided by (Used in) Financing Activities, Total 183,842 184,808
Increase (decrease) in cash and cash equivalents (19,648) 12,891
Cash and cash equivalents -- beginning of year 70,428 40,772
Cash and cash equivalents -- end of period $ 50,780 $ 53,663