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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Components of accumulated other comprehensive loss
Unrecognized pension and postretirement costs, net of tax	$ (8,002)	$ (7,071)
Foreign currency translation losses, net of tax	(3,760)	(6,303)
Total accumulated other comprehensive loss, net of tax	$ (11,762)	$ (13,374)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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