Receivables Installment Receivables by Class (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	$ 5,948	$ 6,488
Unpaid Principal Balance	5,878	6,417
Related Allowance for Doubtful Accounts	3,642	3,823
Interest Income Recognized	76	120
CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	1,438	1,980
Unpaid Principal Balance	1,368	1,909
Related Allowance for Doubtful Accounts	165	458
Interest Income Recognized	76	120
Impaired Installment Receivables with Related Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	4,675	4,966
Unpaid Principal Balance	4,675	4,966
Related Allowance for Doubtful Accounts	3,642	3,823
Interest Income Recognized	0	0
Impaired Installment Receivables with Related Allowance [Member] | U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	4,510	4,508
Unpaid Principal Balance	4,510	4,508
Related Allowance for Doubtful Accounts	3,477	3,365
Interest Income Recognized	0	0
Impaired Installment Receivables with Related Allowance [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	165	458
Unpaid Principal Balance	165	458
Related Allowance for Doubtful Accounts	165	458
Interest Income Recognized	0	0
Installment Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	1,273	1,522
Unpaid Principal Balance	1,203	1,451
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	76	120
Installment Receivables [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	1,273	1,522
Unpaid Principal Balance	1,203	1,451
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	$ 76	$ 120