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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating activities |  |
Net cash provided by operating activities | $ 67,794 | $ 2,760
Investing activities |  |
Expenditures for property, plant and equipment and acquisition of mineral interests | (35,534) | (19,802)
Proceeds from the sale of property, plant and equipment | 547 | 550
Purchase of equity securities | 0 | (2,000)
Other | (52) | 72
Net cash used for investing activities | (35,039) | (21,180)
Financing activities |  |
Additions to long-term debt | 3,633 | 6,199
Reductions of long-term debt | (3,131) | (1,057)
Net reductions to revolving credit agreements | (30,000) | (7,000)
Cash dividends paid | (4,200) | (4,045)
Purchase of treasury shares | 0 | (1,002)
Net cash used for financing activities | (33,698) | (6,905)
Cash and cash equivalents |  |
Total decrease for the period | (943) | (25,325)
Balance at the beginning of the period | 88,450 | 122,892
Balance at the end of the period | $ 87,507 | $ 97,567

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