Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Other Financial Instrument
Cash and cash equivalents		$ 305,197	$ 109,484
Investment in equity securities		14,803	15,685
Net financed sales receivables		109,645	112,432
Net investment in sales-type leases		17,095	15,606
Foreign exchange contracts — forwards		(482)	(530)
Bank indebtedness - under the Credit Facility		(300,000)	(20,000)
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Other Financial Instrument
Cash and cash equivalents	[1]	305,197	109,484
Investment in equity securities	[2]	14,803	15,685
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]	109,645	112,432
Net investment in sales-type leases	[3]	17,095	15,606
Convertible loan receivable	[3]	0	1,500
COLI	[4]	3,125	3,150
Bank indebtedness - under the Working Capital Facility	[1]	(253)	0
Bank indebtedness - under the Credit Facility	[1]	(300,000)	(20,000)
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]
Other Financial Instrument
Foreign exchange contracts — forwards	[2]	380	530
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]
Other Financial Instrument
Foreign exchange contracts — forwards	[2]	102	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Other Financial Instrument
Cash and cash equivalents	[1]	305,197	109,484
Investment in equity securities	[2]	14,803	15,685
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]	110,443	111,441
Net investment in sales-type leases	[3]	16,829	15,309
Convertible loan receivable	[3]	0	1,500
COLI	[4]	3,125	3,150
Bank indebtedness - under the Working Capital Facility	[1]	(253)	0
Bank indebtedness - under the Credit Facility	[1]	(300,000)	(20,000)
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 — forwards	[2]	380	530
Estimate of Fair Value, Fair Value Disclosure [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]
Other Financial Instrument
Foreign exchange contracts — forwards	[2]	$ 102	$ 0

[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.

[4] Measured at cash surrender value, which approximates fair value.