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Comprehensive Income (Loss) - Changes in accumulated comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income (Loss)
Foreign Currency Translation Adjustments, Beginning balance			$ (6,050)
Foreign Currency Translation Adjustments, Other comprehensive loss before reclassifications			(568)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income			(568)
Foreign Currency Translation Adjustments, Ending balance	$ (6,618)		(6,618)
Defined Benefit Pension Items, Beginning balance			(21,955)
Defined Benefit Pension Items, Other comprehensive loss before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	183	$ 142	548	$ 424
Defined Benefit Pension Items, Net current period other comprehensive (loss) income			548
Defined Benefit Pension Items, Ending balance	(21,407)		(21,407)
Beginning balance			(28,005)
Other comprehensive loss before reclassifications			(568)
Amounts reclassified from accumulated other comprehensive loss			548
Net current period other comprehensive (loss) income			(20)
Ending balance	$ (28,025)		$ (28,025)