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Benefit Plans, Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current liabilities	$ (438)	$ (406)
Noncurrent liabilities	(8,563)	(7,893)
Total amounts recognized	(9,001)	(8,299)
Net actuarial loss recognized in accumulated other comprehensive loss	$ 2,554	$ 1,923

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Amount, after 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 of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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