Receivables Installment Receivables by Class (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	$ 7,790	$ 11,921
Unpaid Principal Balance	7,710	11,750
Related Allowance for Doubtful Accounts	4,117	4,273
Interest Income Recognized	68	271
CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	2,166	5,805
Unpaid Principal Balance	2,086	5,634
Related Allowance for Doubtful Accounts	376	33
Interest Income Recognized	68	271
Impaired Installment Receivables with Related Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	6,000	6,225
Unpaid Principal Balance	6,000	6,225
Related Allowance for Doubtful Accounts	4,117	4,273
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	5,624	6,116
Unpaid Principal Balance	5,624	6,116
Related Allowance for Doubtful Accounts	3,741	4,240
Interest Income Recognized	0	0
Impaired Installment Receivables with Related Allowance [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	376	109
Unpaid Principal Balance	376	109
Related Allowance for Doubtful Accounts	376	33
Interest Income Recognized	0	0
Installment Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	1,790	5,696
Unpaid Principal Balance	1,710	5,525
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	68	271
Installment Receivables [Member] | CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Installment Receivables	1,790	5,696
Unpaid Principal Balance	1,710	5,525
Related Allowance for Doubtful Accounts	0	0
Interest Income Recognized	$ 68	$ 271