Comprehensive Income - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Comprehensive Income
Foreign Currency Translation Adjustments, Beginning balance			$ (8,596)	$ (6,783)
Foreign Currency Translation Adjustments, Other comprehensive income (loss) before reclassifications			(44)	(714)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0	0
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income			(44)	(714)
Foreign Currency Translation Adjustments, Ending balance	$ (8,640)	$ (7,497)	(8,640)	(7,497)
Defined Benefit Pension Items, Beginning balance			(11,597)	(18,011)
Defined Benefit Pension Items, Other comprehensive (loss) income before reclassifications			0	0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	84	170	183	324
Defined Benefit Pension Items, Net current period other comprehensive (loss) income			183	324
Defined Benefit Pension Items, Ending balance	(11,414)	(17,687)	(11,414)	(17,687)
Beginning balance			(20,193)	(24,794)
Other comprehensive loss before reclassifications			(44)	(714)
Amounts reclassified from accumulated other comprehensive loss			183	324
Net current period other comprehensive (loss) income			139	(390)
Ending balance	$ (20,054)	$ (25,184)	$ (20,054)	$ (25,184)

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

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

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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, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount, after tax, before reclassification adjustment, of (increase) decrease in accumulated other comprehensive income of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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