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Comprehensive Income (Loss) - Changes in accumulated comprehensive loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Comprehensive Income (Loss)    
Foreign Currency Translation Adjustments, Beginning balance $ (6,050) $ (7,033)
Foreign Currency Translation Adjustments, Other comprehensive (loss) income before reclassifications (733) 983
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income (733) 983
Foreign Currency Translation Adjustments, Ending balance (6,783) (6,050)
Defined Benefit Pension Items, Beginning balance (21,955) (17,503)
Defined Benefit Pension Items, Other comprehensive (loss) income before reclassifications 3,196 (5,017)
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 748 565
Defined Benefit Pension Items, Net current period other comprehensive (loss) income 3,944 (4,452)
Defined Benefit Pension Items, Ending balance (18,011) (21,955)
Beginning balance (28,005) (24,536)
Other comprehensive (loss) income before reclassifications 2,463 (4,034)
Amounts reclassified from accumulated other comprehensive loss 748 565
Net current period other comprehensive (loss) income 3,211 (3,469)
Ending balance $ (24,794) $ (28,005)