Plan of Restructuring (Details) - Restructuring cost by reportable segment (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	$ 162	$ 205
Segmented Restructuring Provision	50
Segmented Restructuring Payment and Other Adjustment	93
Digital Display Sales [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	105	158
Segmented Restructuring Provision	1
Segmented Restructuring Payment and Other Adjustment	54
Digital Display Lease And Maintenance [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	57	47
Segmented Restructuring Provision	49
Segmented Restructuring Payment and Other Adjustment	$ 39