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Stock-Based Compensation (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2013
Plan
Dec. 31, 2012
Stock-based compensation (Textual) [Abstract]    
Shares authorized 75,000,000 75,000,000
Vesting period of grant date 1 year  
Number of restricted unit would vest over vesting period 55,200  
Restricted stock unit vest description 55,200 of these restricted stock units will vest and convert into shares of our common stock over a four year period  
Stock Based Compensation (Additional Textual) [Abstract]    
Equity Incentive Plans 2  
Total unrecognized compensation expense $ 1,875,000  
Vesting period 1 year 9 months 18 days  
Number of restricted unit vest over next fiscal year 10,000  
Number of restricted unit would vest over vesting period 55,200  
Restricted Stock Units Vested Description After Specified Period 0.25  
Exercise price $ 20.00  
Options [Member]
    
Stock-based compensation (Textual) [Abstract]    
Term of years 4 years  
Percentage of vested grant date 25.00%  
Percentage of vested grant date 75.00%  
Unexercised vested option forfeiture 3 months  
Estimated fair value $ 124,000  
Options [Member] | Maximum [Member]
    
Stock-based compensation (Textual) [Abstract]    
Term of years 10 years  
Vesting period of grant date 3 years  
Stock Appreciation Rights (SARs) [Member]
    
Stock-based compensation (Textual) [Abstract]    
Percentage of vested grant date 25.00%  
Percentage of vested grant date 75.00%  
Vesting period of grant date 3 years  
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
    
Stock-based compensation (Textual) [Abstract]    
Term of years 10 years  
Restricted Stock One [Member]
    
Stock-based compensation (Textual) [Abstract]    
Restricted stock units vest and convert into shares of our common stock 1 year  
Restricted Stock Three [Member]
    
Stock-based compensation (Textual) [Abstract]    
Restricted stock units vest and convert into shares of our common stock 4 years  
Equity incentive plans [Member]
    
Stock-based compensation (Textual) [Abstract]    
Shares authorized   593,199
Annual increase in number of shares of common stock 4.00%  
Aggregate limit of shares issuable to incentive stock option awards 3,000,000