Receivables (Aging of Installment Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 530	$ 659
0-30 Days Past Due	11	2
31-60 Days Past Due	0	4
61-90 Days Past Due	0	0
90 Days Past Due	1,702	1,784
Total Installment Receivables Past Due	2,243	2,449
U.S.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
0-30 Days Past Due	0	0
31-60 Days Past Due	0	0
61-90 Days Past Due	0	0
90 Days Past Due	1,700	1,762
Total Installment Receivables Past Due	1,700	1,762
CANADA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	530	659
0-30 Days Past Due	11	2
31-60 Days Past Due	0	4
61-90 Days Past Due	0	0
90 Days Past Due	2	22
Total Installment Receivables Past Due	$ 543	$ 687