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Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Financial Instrument    
Cash and cash equivalents $ 102,548 $ 141,590
Investment in equity securities 13,659 1,022
Net financed sales receivables 109,844 117,990
Net investment in sales-type leases 11,496 9,442
Convertible loan receivable 1,500  
Foreign exchange contracts — designated forwards 350 1,202
Borrowings under the Credit Facility (20,000) (40,000)
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]    
Other Financial Instrument    
Cash and cash equivalents [1] 102,548 141,590
Investment in equity securities [2] 13,660 1,022
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]    
Other Financial Instrument    
Investment in equity securities [1] 1,000 1,000
Net financed sales receivables [3] 109,844 117,990
Net investment in sales-type leases [3] 11,496 9,442
Convertible loan receivable [3] 1,500 1,500
Borrowings under the Credit Facility [1] (20,000) (40,000)
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]    
Other Financial Instrument    
Foreign exchange contracts — designated forwards [2] (350) (1,202)
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]    
Other Financial Instrument    
Cash and cash equivalents [1] 102,548 141,590
Investment in equity securities [2] 13,660 1,022
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]    
Other Financial Instrument    
Investment in equity securities [1] 1,000 1,000
Net financed sales receivables [3] 108,993 117,428
Net investment in sales-type leases [3] 11,526 9,529
Convertible loan receivable [3] 1,500 1,500
Borrowings under the Credit Facility [1] (20,000) (40,000)
Estimate of Fair Value, Fair Value Disclosure [Member] | Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]    
Other Financial Instrument    
Foreign exchange contracts — designated forwards [2] $ (350) $ (1,202)
[1] Recorded at cost, which approximates fair value.
[2] Value determined using quoted prices in active markets.
[3] Estimated based on discounting future cash flows at currently available interest rates with comparable terms.