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Financial Instruments - Aging of Financing Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables $ 10,029   $ 9,072      
Related Unbilled Recorded Investment 112,381   119,354      
Total Recorded Investment 122,410   128,426      
Related Allowances (1,070)   (994)      
Recorded Investment Net of Allowances 121,340   127,432      
Net Investment in Leases [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 460   323      
Related Unbilled Recorded Investment 11,191   9,274      
Total Recorded Investment 11,651   9,597      
Related Allowances (155) $ (155) (155) $ (155) $ (155) $ (155)
Recorded Investment Net of Allowances 11,496   9,442      
Net Financed Sales Receivables [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 9,569   8,749      
Related Unbilled Recorded Investment 101,190   110,080      
Total Recorded Investment 110,759   118,829      
Related Allowances (915) $ (839) (839) $ (839) $ (839) $ (922)
Recorded Investment Net of Allowances 109,844   117,990      
Financing Receivables Accrued and Current            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 1,980   1,494      
Financing Receivables Accrued and Current | Net Investment in Leases [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 99   52      
Financing Receivables Accrued and Current | Net Financed Sales Receivables [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 1,881   1,442      
Financing Receivables 30 to 89 Days Past Due [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 2,163   2,084      
Financing Receivables 30 to 89 Days Past Due [Member] | Net Investment in Leases [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 46   18      
Financing Receivables 30 to 89 Days Past Due [Member] | Net Financed Sales Receivables [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 2,117   2,066      
Financing Receivables Equal To Greater Than 90 Days Past Due [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 5,886   5,494      
Financing Receivables Equal To Greater Than 90 Days Past Due [Member] | Net Investment in Leases [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables 315   253      
Financing Receivables Equal To Greater Than 90 Days Past Due [Member] | Net Financed Sales Receivables [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Billed Financing Receivables $ 5,571   $ 5,241