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Comprehensive Income - Changes in accumulated comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive Income
Foreign Currency Translation Adjustments, Beginning balance			$ (6,901)
Foreign Currency Translation Adjustments, Other comprehensive (loss) income before reclassifications			(481)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive loss (income)			(481)
Foreign Currency Translation Adjustments, Ending balance	$ (7,382)		(7,382)
Defined Benefit Pension Items, Beginning balance			(14,671)
Defined Benefit Pension Items, Other comprehensive loss before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	116	$ 116	347	$ 352
Defined Benefit Pension Items, Net current period other comprehensive loss (income)			347
Defined Benefit Pension Items, Ending balance	(14,324)		(14,324)
Beginning balance			(21,572)
Other comprehensive (loss) income before reclassifications			(481)
Amounts reclassified from accumulated other comprehensive loss			347
Net current period other comprehensive loss (income)			(134)
Ending balance	$ (21,706)		$ (21,706)