Receivables Aging of Installment Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 1,467	$ 5,612
0-30 Days Past Due	43	84
31-60 Days Past Due	2	42
61-90 Days Past Due	0	8
Greater than 90 Days Past Due	4,976	6,175
Total Installment Receivables Past Due	6,488	11,921
U.S.
Accounts, Notes, Loans and Financing Receivable [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
Greater than 90 Days Past Due	4,508	6,116
Total Installment Receivables Past Due	4,508	6,116
CANADA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,467	5,612
0-30 Days Past Due	43	84
31-60 Days Past Due	2	42
61-90 Days Past Due	0	8
Greater than 90 Days Past Due	468	59
Total Installment Receivables Past Due	$ 1,980	$ 5,805