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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization of defined benefit pension items
Prior service cost			$ (31)
Actuarial losses			413
Total before tax			382
Tax benefit			(100)
Net of tax	$ 144	$ 123	$ 282	$ 231

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