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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities    
Net cash used for operating activities $ (31,122) $ (544)
Investing activities    
Expenditures for property, plant and equipment (5,358) (4,252)
Proceeds from the sale of property, plant and equipment 0 18
Other 16 (13)
Net cash used for investing activities (5,342) (4,247)
Financing activities    
Additions to long-term debt 6,232 1,206
Reductions of long-term debt (593) (161)
Net additions to revolving credit agreements 4,000 0
Cash dividends paid (1,339) (1,153)
Purchase of treasury shares (1,002) (1,300)
Net cash provided by (used for) financing activities 7,298 (1,408)
Cash and cash equivalents    
Total decrease for the period (29,166) (6,199)
Balance at the beginning of the period 122,892 85,257
Balance at the end of the period $ 93,726 $ 79,058