Correction of Treatment for Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Scenario, Adjustment [Member]	Dec. 31, 2010 Scenario, Adjustment [Member]	Dec. 31, 2009 Scenario, Adjustment [Member]
Reward Points Redemption Period	3 years
Net Income (Loss), From Continuing Operations, Impact of Adjustment		$ 0.4	$ 0.3
Retained Earnings (Accumulated Deficit), Impact of Adjustment				$ 0.5