Receivables (Aging of Installment Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,030	$ 908
0-30 Days Past Due	8	16
31-60 Days Past Due	3	12
61-90 Days Past Due	0	1
90 Days Past Due	4,259	3,690
Total Installment Receivables Past Due	5,300	4,627
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	4,178	3,618
Total Installment Receivables Past Due	4,178	3,618
CANADA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,030	908
0-30 Days Past Due	8	16
31-60 Days Past Due	3	12
61-90 Days Past Due	0	1
90 Days Past Due	81	72
Total Installment Receivables Past Due	$ 1,122	$ 1,009