Receivables Installment Receivables by Class (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	$ 11,921	$ 10,631
Unpaid Principal Balance	11,750	10,513
Related Allowance for Doubtful Accounts	4,273	4,841
Interest Income Recognized	271	109
CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	5,805	3,478
Unpaid Principal Balance	5,634	3,360
Related Allowance for Doubtful Accounts	33	19
Interest Income Recognized	271	109
Impaired Installment Receivables with Related Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	6,225	7,409
Unpaid Principal Balance	6,225	7,409
Related Allowance for Doubtful Accounts	4,273	4,841
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	6,116	7,153
Unpaid Principal Balance	6,116	7,153
Related Allowance for Doubtful Accounts	4,240	4,822
Interest Income Recognized	0	0
Impaired Installment Receivables with Related Allowance [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	109	256
Unpaid Principal Balance	109	256
Related Allowance for Doubtful Accounts	33	19
Interest Income Recognized	0	0
Installment Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	5,696	3,222
Unpaid Principal Balance	5,525	3,104
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	271	109
Installment Receivables [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	5,696	3,222
Unpaid Principal Balance	5,525	3,104
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	$ 271	$ 109