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Comprehensive Income (Loss) - Changes in accumulated comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Comprehensive Income (Loss)
Foreign Currency Translation Adjustments, Beginning balance			$ (7,033)
Foreign Currency Translation Adjustments, Other comprehensive income before reclassifications			(968)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive income			(968)
Foreign Currency Translation Adjustments, Ending balance	$ (8,001)		(8,001)
Defined Benefit Pension Items, Beginning balance			(17,503)
Defined Benefit Pension Items, Other comprehensive loss before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	144	$ 123	282	$ 231
Defined Benefit Pension Items, Net current period other comprehensive income			282
Defined Benefit Pension Items, Ending balance	(17,221)		(17,221)
Beginning balance			(24,536)
Other comprehensive loss before reclassifications			(968)
Amounts reclassified from accumulated other comprehensive loss			282
Net current period other comprehensive income (loss)			(686)
Ending balance	$ (25,222)		$ (25,222)