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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Unrecognized pension and postretirement benefit costs, net of tax	$ (9,107)	$ (9,153)
Foreign currency translation losses, net of tax	(5,938)	(5,195)
Total accumulated other comprehensive loss	$ (15,045)	$ (14,348)

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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