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Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Current portion of pension benefit obligation in wages and benefits payable	$ 3,569	$ 3,069
Long-term portion of pension benefit obligation	116,666	119,457
Pension benefit obligation, net	$ 120,235	$ 122,526

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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