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Comprehensive Income - Changes in accumulated comprehensive loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Comprehensive Income        
Foreign Currency Translation Adjustments, Beginning balance     $ (6,783) $ (6,050)
Foreign Currency Translation Adjustments, Other comprehensive loss income before reclassifications     (714) 33
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss     0 0
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income     (714) 33
Foreign Currency Translation Adjustments, Ending balance $ (7,497) $ (6,017) (7,497) (6,017)
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 170 182 324 365
Defined Benefit Pension Items, Net current period other comprehensive (loss) income     324 365
Defined Benefit Pension Items, Ending balance (17,687) (21,590) (17,687) (21,590)
Beginning balance     (24,794) (28,005)
Other comprehensive loss before reclassifications     (714) 33
Amounts reclassified from accumulated other comprehensive loss     324 365
Net current period other comprehensive (loss) income     (390) 398
Ending balance $ (25,184) $ (27,607) $ (25,184) $ (27,607)