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Comprehensive Income (Loss) - Changes in accumulated comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Comprehensive Income (Loss)
Foreign Currency Translation Adjustments, Beginning balance			$ (6,901)
Foreign Currency Translation Adjustments, Other comprehensive (loss) income before reclassifications			230
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive loss (income)			230
Foreign Currency Translation Adjustments, Ending balance	$ (6,671)		(6,671)
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	123	$ 118	231	$ 236
Defined Benefit Pension Items, Net current period other comprehensive loss (income)			231
Defined Benefit Pension Items, Ending balance	(14,440)		(14,440)
Beginning balance			(21,572)
Other comprehensive (loss) income before reclassifications			230
Amounts reclassified from accumulated other comprehensive loss			231
Net current period other comprehensive loss (income)			461
Ending balance	$ (21,111)		$ (21,111)