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Leases (Schedule of Leased Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets    
Operating lease, assets $ 10,748 $ 11,398
Finance lease, assets 98 544
Current liabilities    
Operating lease liabilities, current 1,308 1,318
Finance lease liabilities, current 33 558
Liabilities, Noncurrent    
Operating lease liabilities, noncurrent 11,782 12,448
Finance lease liabilities, noncurrent 68 85
Finance lease, accumulated amortization $ 100 $ 1,900
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtCurrent  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtNoncurrent