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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Change in pension plan and supplemental pension plan liability, tax $ 0 $ 200 $ 0 $ 200