Comprehensive Income - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Comprehensive Income
Foreign Currency Translation Adjustments, Beginning balance	$ (7,954)	$ (8,596)
Foreign Currency Translation Adjustments, Other comprehensive income (loss) before reclassifications	(1,092)	(306)
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income	(1,092)	(306)
Foreign Currency Translation Adjustments, Ending balance	(9,046)	(8,902)
Defined Benefit Pension Items, Beginning balance	(9,357)	(11,597)
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	73	99
Defined Benefit Pension Items, Net current period other comprehensive (loss) income	73	99
Defined Benefit Pension Items, Ending balance	(9,284)	$ (11,498)
Beginning balance	(17,311)
Ending balance	$ (18,330)

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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- Definition

The increase (decrease) in cumulative translation adjustment before transfers included in determining net income.

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- Definition

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net periodic benefit cost (credit) of defined benefit plan.

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