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Stock-Based Compensation (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Plan
Dec. 31, 2011
Dec. 31, 2010
Stock-based compensation (Textual) [Abstract]      
Equity Incentive Plans 2    
Shares authorized 75,000,000 75,000,000  
Total unrecognized compensation expense $ 2,322,000    
Vesting period 1 year 8 months 12 days    
Term of years 6 years 4 months 24 days 7 years 4 months 24 days 7 years 2 months 12 days
Vesting period of grant date 1 year    
Estimated fair value per share of options granted $ 0.00 $ 5.31 $ 8.40
Intrinsic value of options at time of exercise 4,319 11,293 13,418
Number of restricted unit vest over next fiscal year 75,000    
Number of restricted unit would vest over vesting period 536,000    
Exercise price $ 21.06    
Restricted stock unit vest description 536,000 and 747,000 of these restricted stock units vest and convert into shares of our common stock over a three and four year period from the date of grant: one-third and one-fourth of the award will vest on each grant date anniversary following the grant.    
Options [Member]
      
Stock-based compensation (Textual) [Abstract]      
Vesting period 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 627,000 1,545,000 2,179,000
Options [Member] | Maximum [Member]
      
Stock-based compensation (Textual) [Abstract]      
Term of years 10 years    
Restricted Stock [Member]
      
Stock-based compensation (Textual) [Abstract]      
Percentage of vested grant date 25.00%    
Vesting period of grant date 4 years    
Number Of Restricted Stock Unit Vest Over Four Years From Grant Date 747,000    
Restricted Stock [Member] | Maximum [Member]
      
Stock-based compensation (Textual) [Abstract]      
Term of years 10 years    
Vesting period of grant date 3 years    
Restricted Stock [Member] | Minimum [Member]
      
Stock-based compensation (Textual) [Abstract]      
Vesting period of grant date 1 year    
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    
Liability related to the SARs 18,000 265,000 344,000
SAR Stock appreciation right, compensation liability re measured value $ 17,000    
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 Two [Member]
      
Stock-based compensation (Textual) [Abstract]      
Restricted stock units vest and convert into shares of our common stock 3 years    
Award vest on each grant date anniversary 33.3333%    
Restricted Stock Three [Member]
      
Stock-based compensation (Textual) [Abstract]      
Restricted stock units vest and convert into shares of our common stock 4 years    
Award vest on each grant date anniversary 25.00%    
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