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Employee Benefit Plans - Other changes in the plan assets and benefit obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other changes recognized in accumulated other comprehensive income (loss)
Pension liability, beginning of year	$ 15,468	$ 9,146	$ 8,450
Net prior service cost	(216)	(214)	(179)
Net loss	8,579	6,536	875
Pension liability, end of year	$ 23,831	$ 15,468	$ 9,146

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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