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Pension and Other Post-Retirement Benefits - Benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Retirement Benefits [Abstract]
Service costs	$ 368	$ 226
Interest cost	82	79
Expected return on plan assets	(52)	(40)
Amortization of actuarial gains	(6)	(19)
Net periodic benefit cost	$ 392	$ 246

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