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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Operating activities |  |
Net cash provided by (used for) operating activities | $ 29,318 | $ (12,489)
Investing activities |  |
Expenditures for property, plant and equipment and acquisition of mineral interests | (16,127) | (12,799)
Proceeds from the sale of property, plant and equipment | 59 | 550
Purchase of equity securities | 0 | (2,000)
Other | (21) | (395)
Net cash used for investing activities | (16,089) | (14,644)
Financing activities |  |
Additions to long-term debt | 0 | 6,302
Reductions of long-term debt | (2,881) | (823)
Net reductions to revolving credit agreements | (11,000) | (2,000)
Cash dividends paid | (2,786) | (2,690)
Purchase of treasury shares | 0 | (1,002)
Net cash used for financing activities | (16,667) | (213)
Cash and cash equivalents |  |
Total decrease for the period | (3,438) | (27,346)
Balance at the beginning of the period | 88,450 | 122,892
Balance at the end of the period | $ 85,012 | $ 95,546

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