Plan of Restructuring (Details) - Restructuring cost by reportable segment (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	$ 88	$ 205
Segmented Restructuring Provision	49
Segmented Restructuring Payment and Other Adjustment	166
Digital Display Sales [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	65	158
Segmented Restructuring Provision	1
Segmented Restructuring Payment and Other Adjustment	94
Digital Display Lease And Maintenance [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	23	47
Segmented Restructuring Provision	48
Segmented Restructuring Payment and Other Adjustment	$ 72