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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Stockholders' Equity Note [Abstract]    
Unrecognized pension and postretirement benefit costs, net of tax $ (7,021) $ (7,071)
Foreign currency translation losses, net of tax (7,215) (6,303)
Total accumulated other comprehensive loss $ (14,236) $ (13,374)