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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities |  |
Net cash used for operating activities | $ (910) | $ (31,122)
Investing activities |  |
Expenditures for property, plant and equipment and acquisition of mineral interests | (4,876) | (5,358)
Proceeds from the sale of property, plant and equipment | 44 | 0
Other | (15) | 16
Net cash used for investing activities | (4,847) | (5,342)
Financing activities |  |
Additions to long-term debt | 170 | 6,232
Reductions of long-term debt | (357) | (593)
Net (reductions) additions to revolving credit agreements | (2,000) | 4,000
Cash dividends paid | (1,374) | (1,339)
Purchase of treasury shares | 0 | (1,002)
Net cash (used for) provided by financing activities | (3,561) | 7,298
Cash and cash equivalents |  |
Total decrease for the period | (9,318) | (29,166)
Balance at the beginning of the period | 88,450 | 122,892
Balance at the end of the period | $ 79,132 | $ 93,726

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