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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities    
Net cash provided by operating activities $ 2,760 $ 47,264
Investing activities    
Expenditures for property, plant and equipment (19,802) (13,264)
Proceeds from the sale of property, plant and equipment 550 4,475
Purchase of equity securities (2,000) 0
Other 72 (20)
Net cash used for investing activities (21,180) (8,809)
Financing activities    
Additions to long-term debt 6,199 1,065
Reductions of long-term debt (1,057) (498)
Net reduction to revolving credit agreements (7,000) (4,000)
Cash dividends paid (4,045) (3,808)
Purchase of treasury shares (1,002) (1,410)
Net cash used for financing activities (6,905) (8,651)
Cash and cash equivalents    
Total (decrease) increase for the period (25,325) 29,804
Balance at the beginning of the period 122,892 85,257
Balance at the end of the period $ 97,567 $ 115,061