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Defined Benefit Pension Plans - Schedule of Defined Benefit Plans Disclosures (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 303	$ 320
Interest cost	2,818	4,141
Expected return on assets	(6,270)	(7,018)
Amortization of actuarial loss	2,642	2,620
Net periodic (benefit)/cost	$ (507)	$ 63

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