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Supplemental Cash Flow and Non-Cash Information (Schedule Of Supplemental Cash Flow and Non-Cash Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]      
Income taxes paid, net $ 20,558 $ 18,071 $ 16,895
Interest paid 8,207 9,048 8,347
Non-cash investing activity:      
Additions to property, plant and equipment in accounts payable $ 8,614 $ 3,164 $ 9,119