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Pension - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Service Cost	$ 247	$ 209	$ 302
Interest Cost	1,179	1,338	1,265
Amortization of Prior Service Cost (Credit)	221	(17)	(193)
Recognized Net Actuarial Loss	383	242	865
Curtailment Gain	0	0	(416)
Net Periodic Benefit Cost	$ 2,030	$ 1,772	$ 1,823

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