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Stock Options (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,270,118
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 2.6
Stock Appreciation Rights (Sars) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms The maximum number of shares of common stock that may be issued under the 2009 Plan is 2,270,118 shares, less one share for every share that becomes subject to an Option or Stock Appreciation Rights (SAR) granted after March 31, 2012