Receivables Aging of Installment Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 5,612
0-30 Days Past Due	84
31-60 Days Past Due	42
61-90 Days Past Due	8
Greater than 90 Days Past Due	6,175
Total Installment Receivables Past Due	11,921
U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0
0-30 Days Past Due	0
31-60 Days Past Due	0
61-90 Days Past Due	0
Greater than 90 Days Past Due	6,116
Total Installment Receivables Past Due	6,116
CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	5,612
0-30 Days Past Due	84
31-60 Days Past Due	42
61-90 Days Past Due	8
Greater than 90 Days Past Due	59
Total Installment Receivables Past Due	$ 5,805