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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of accumulated other comprehensive loss    
Unrecognized pension and postretirement costs, net of tax $ (7,071) $ (9,153)
Foreign currency translation losses, net of tax (6,303) (5,195)
Total accumulated other comprehensive loss, net of tax $ (13,374) $ (14,348)