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Share-Based Payments (Details Textual)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares issued under ESPP 68,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 74,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans