Receivables - Aging of Installment Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 908	$ 976
0-30 days past due	16	15
31-60 days past due	12	2
61-90 days past due	1	0
90 days past due	3,690	6,816
Total	4,627	7,809
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	3,618	6,735
Total	3,618	6,735
CANADA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	908	976
0-30 days past due	16	15
31-60 days past due	12	2
61-90 days past due	1	0
90 days past due	72	81
Total	$ 1,009	$ 1,074