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Comprehensive Income - Changes in accumulated comprehensive loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Comprehensive Income    
Foreign Currency Translation Adjustments, Beginning balance $ (6,783) $ (6,050)
Foreign Currency Translation Adjustments, Other comprehensive loss income before reclassifications 521 (143)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss 0 0
Foreign Currency Translation Adjustments, Net current period other comprehensive income 521 (143)
Foreign Currency Translation Adjustments, Ending balance (6,262) (6,193)
Defined Benefit Pension Items, Beginning balance (18,011) (21,955)
Defined Benefit Pension Items, Other comprehensive (loss) income before reclassifications 0 0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss 154 183
Defined Benefit Pension Items, Net current period other comprehensive (loss) income 154 183
Defined Benefit Pension Items, Ending balance (17,857) (21,772)
Beginning balance (24,794) (28,005)
Other comprehensive loss before reclassifications 521 (143)
Amounts reclassified from accumulated other comprehensive loss 154 183
Net current period other comprehensive (loss) income 675 40
Ending balance $ (24,119) $ (27,965)