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Stockholders' Equity (Details Textual) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Qualified Stock Option Plans [Member]
Dec. 31, 2010
Qualified Stock Option Plans [Member]
Dec. 31, 2011
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2010
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2011
Preferred Share Rights Plan [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Dec. 31, 2009
Other [Member]
Dec. 31, 2011
2008 Plan [Member]
Dec. 31, 2011
2008 Plan [Member]
Qualified Stock Option Plans [Member]
Dec. 31, 2011
2008 Plan [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2011
1998 Plan [Member]
Jun. 14, 2007
2006 Options [Member]
Non-Qualified Stock Option Plans [Member]
Dec. 31, 2011
Outside Director Plan [Member]
Non-Qualified Stock Option Plans [Member]
Stockholders' Equity (Textual) [Abstract]                              
Minimum exercise price of stock option at grant date                   no less than 100% of fair market value at the grant date          
Percentage of fair market value                   100.00%          
Maximum term of stock options                   10 years          
Qualified and non qualified options vest at a percentage rate for first 5 years                   16.50%          
Qualified and non qualified options final year vesting                   End of the sixth year          
Exercisable period Non-qualified option following termination event                   Fully vested and excersable for period of one year from the date of the termination event          
Exercisable period after termination                   1 year          
Total stock based compensation expense not yet recognized, relating to non-vested stock options                   $ 7,931,000          
Stock option plans, options outstanding   516,330 389,026 316,525 374,600         505,330   41,525 11,000   0
Stock options available for grant                   344,370         280,000
Number of common stock shares for issuance                   1,000,000 249,000 5,000   450,000 400,000
Exercise price of Options   $ 8.85   $ 7.97                   $ 8.01  
Minimum percentage of ownership of common stock required to exercise preferred share rights           15.00%                  
Series 4 Junior participating preferred stock                               
Exercise price of preferred Stock           47.75 per one one-hundredth of a share                  
Preferred share right plan description           If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time                  
Redemption price preferred share rights           $ 0.01                  
Maximum time for redemption after the Rights become exercisable           10 days                  
Preferred share right exchange ratio           one common share per Right                  
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange           Until the person triggering the Rights becomes the benefical owner of 50% or more of the entity's common stock.                  
Number of shares of treasury stock purchased             0 177,100 275,900            
Average price of treasury stock             $ 0.00 $ 13.67 $ 11.60            
Number of shares converted             1,800,000                
Stock Options Exercisable, Shares Exercisable                       16,325      
Date of approval of stock incentive plan Jun. 05, 2008                            
Term of historical volatility of common stock 6 years