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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |
Net income | $ 378,131 | $ 390,205 | $ 335,453
Income (loss) from discontinued operations, net of tax | 400 | (322) | 287
Income from continuing operations | 377,731 | 390,527 | 335,166
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, depletion and amortization | 299,214 | 285,100 | 256,017
Deferred income taxes | 60,250 | (1,801) | 63,415
Provision for credit losses | 1,085 | 10,576 | 7,864
Amortization of debt issuance costs | 1,333 | 2,162 | 1,330
Employee stock-based compensation costs | 14,709 | 13,096 | 7,353
Pension & postretirement benefit plan net periodic benefit cost (credit) | (4,900) | (3,001) | 703
Unrealized gains on investments | (7,728) | (14,563) | (11,445)
Gains on sales of assets | (13,056) | (15,350) | (15,479)
Changes in current assets and liabilities, net of acquisitions: |  |  |
Receivables | (60,024) | (2,780) | (112,238)
Inventories | (42,302) | (7,221) | 9,331
Other current assets | (71,964) | 31,601 | (38,283)
Accounts payable | 15,247 | 15,955 | 30,079
Other current liabilities | (17,650) | 35,591 | 51,278
Pension & postretirement benefit plan contributions | (476) | (434) | (25,613)
Other noncurrent changes | (55,367) | 30,291 | (17,662)
Net cash provided by continuing operations | 496,102 | 769,749 | 541,816
Net cash provided by (used in) discontinued operations | (325) | (1,375) | 464
Net cash provided by operating activities | 495,777 | 768,374 | 542,280
Investing activities: |  |  |
Capital expenditures | (659,425) | (558,007) | (576,065)
Acquisitions, net of cash acquired | (237,718) | (105,979) | (55,597)
Net proceeds from sale or disposition of property and other | 15,238 | 35,557 | 29,812
Investments | (3,973) | (1,814) | (2,011)
Net cash used in investing activities | (885,878) | (630,243) | (603,861)
Financing activities: |  |  |
Issuance of short-term borrowings | 50,000 | 75,000 | 170,000
Repayment of short-term borrowings | (100,000) | (25,000) | (170,000)
Issuance of long-term debt | 554,027 | 117,450 | 603,969
Repayment of long-term debt | (24,979) | (148,634) | (468,917)
Debt issuance costs | (918) | (477) | (4,537)
Proceeds from issuance of common stock | 88,767 | 3,385 | 106,848
Dividends paid | (171,354) | (166,405) | (160,256)
Repurchase of common stock | (6,701) | 0 | 0
Tax withholding on stock-based compensation | (4,127) | (362) | (3,015)
Net cash provided by (used in) financing activities | 384,715 | (145,043) | 74,092
Increase (decrease) in cash and cash equivalents | (5,386) | (6,912) | 12,511
Cash and cash equivalents - beginning of year | 59,547 | 66,459 | 53,948
Cash and cash equivalents - end of year | $ 54,161 | $ 59,547 | $ 66,459

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