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Stock Based Awards (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 4,280,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 1 month 6 days    
Fair Value Inputs, Discount Rate 0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 87,950 94,850 105,050
Fair Value Inputs Forfeiture Rate 0.00%    
Stock Incentive Plan 1994 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price $ 19.50    
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights could be exercised in increments of 25% on each anniversary of the date of the grant    
Equity Incentive Plan 2005 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 1,000,000