Receivables (Aging of Installment Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	239	615
Installment Receivable, Not Past Due	1,015	1,194
Financing Receivable, Gross	1,254	1,809
All Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	0	0
Installment Receivable, Not Past Due	1,015	1,194
Financing Receivable, Gross	1,015	1,194
North America (NA)
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	239	615
Installment Receivable, Not Past Due	0	0
Financing Receivable, Gross	$ 239	$ 615