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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Supplemental disclosure:        
Income taxes paid $ 3,167 $ 1,841 $ 5,909 $ 11,576
Non-cash investing and financing activities:        
Non-cash capital expenditures $ (1,052) $ (4,421) $ (2,897) $ 625