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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 302	$ 315	$ 921	$ 946
Interest cost	2,858	4,092	8,533	12,330
Expected return on assets	(6,348)	(6,936)	(18,968)	(20,899)
Amortization of actuarial loss	2,589	2,614	7,760	7,848
Net periodic (benefit) cost	$ (599)	$ 85	$ (1,754)	$ 225

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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