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Defined Benefit Pension Plans - Schedule of Defined Benefit Plans Disclosures (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 315	$ 332	$ 946	$ 1,004
Interest cost	4,092	5,565	12,330	16,763
Expected return on assets	(6,936)	(7,371)	(20,899)	(22,214)
Amortization of actuarial loss	2,614	2,689	7,848	8,073
Net periodic cost	$ 85	$ 1,215	$ 225	$ 3,626

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