Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases
Other non-current assets	$ 10,770	$ 12,858
Accrued liabilities	3,309	3,972
Other long-term liabilities	7,563	8,989
Total operating lease liabilities	10,872	12,961
Finance Leases
Property, plant and equipment, gross	420	524
Accumulated Depreciation	(283)	(265)
Property, plant and equipment, net	137	259
Current maturities of long-term debt and finance lease obligations	68	90
Long-term debt and finance lease obligations, net of current maturities	105	174
Total finance lease liabilities	$ 173	$ 264
Operating Leases Weighted Average Remaining Lease Term	4 years 10 months 2 days	5 years 1 month 6 days
Finance Leases Weighted Average Remaining Lease Term	2 years 8 months 19 days	3 years 5 months 19 days
Operating Lease Weighted Average Discount Rate (as percent)	3.19%	3.29%
Finance Lease Weighted Average Discount Rate (as percent)	3.34%	3.39%
Current operating lease liability, statement of financial position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Noncurrent operating lease liability, statement of financial position	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Finance lease asset, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current finance lease liability, statement of financial position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Noncurrent finance lease liability, statement of financial position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations