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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Defined benefit pension and other post-retirement benefit plans	$ (138,263)	$ (143,389)
Unrealized foreign currency translation gain	1,842	4,289
Unrealized loss on foreign currency forward contracts and interest rate swaps	(32,188)	(10,206)
Total accumulated other comprehensive loss, net of tax	$ (168,609)	$ (149,306)

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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