Plan of Restructuring (Details) - Restructuring cost by reportable segment (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	$ 205	$ 73
Segmented Restructuring Provision	415
Segmented Restructuring Payment and Other Adjustment	283
Digital Display Sales [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	158
Segmented Restructuring Provision	338
Segmented Restructuring Payment and Other Adjustment	180
Digital Display Lease and Maintenance [Member]
Restructuring Cost and Reserve [Line Items]
Segmented Restructuring Balance	47	73
Segmented Restructuring Provision	77
Segmented Restructuring Payment and Other Adjustment	$ 103