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Accumulated Other Comprehensive Loss - Reclassification of component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Amortization of estimated defined benefit pension plan loss
Other expense	$ 720	$ 648
Provision for income taxes	(151)	(136)
Net of tax	569	512
Total reclassifications for the period	$ 569	$ 512

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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

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

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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