Receivables (Aging of Installment Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 995	$ 976
1-29 Days Past Due	2	15
30-59 Days Past Due	1	2
60-89 Days Past Due	2	0
90 Days Past Due	6,735	6,816
Total Installment Receivables Past Due	7,735	7,809
U.S.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
1-29 Days Past Due	0	0
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days Past Due	6,668	6,735
Total Installment Receivables Past Due	6,668	6,735
CANADA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	995	976
1-29 Days Past Due	2	15
30-59 Days Past Due	1	2
60-89 Days Past Due	2	0
90 Days Past Due	67	81
Total Installment Receivables Past Due	$ 1,067	$ 1,074