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Stock-Based Compensation (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option or restricted stock grants under 1997, 2000 and 2004 Employee stock option plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, vesting period 1 year      
Stock options granted to employees under 1997, 2000, and 2004 Employee Stock Option Plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, expiration period 7 years      
Unrecognized compensation cost related to unvested stock options granted under various stock-based compensation plans $ 0      
Total unrecognized compensation costs relating to unvested restricted stock granted under Stock Incentive Plan of 2006 900,000      
Stock-Based Compensation (Textual) [Abstract]        
Stock option or restricted stock grants   0 0 0
Stock options granted to non-executive officers during 2005 3 weeks      
Stock options granted to non-employee directors under Independent Director Stock Option Plan, purchase price as a percentage of market price on date of grant 125.00%      
Number of shares authorized for future incentive awards under our Stock Incentive Plan of 2006 366,000      
Stock option grants, number of shares 0 0 0  
Weighted-average period for recognizing compensation costs related to unvested restricted stock granted under our Stock Incentive Plan of 2006 1 year      
Intrinsic value of all stock options outstanding and exercisable 200,000      
Maximum [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted to employees under 1997, 2000, and 2004 Employee Stock Option Plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, expiration period 10 years      
Restricted stock [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option or restricted stock grants under 1997, 2000 and 2004 Employee stock option plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, vesting period 4 years      
Payments received from employees for restricted stock awards $ 0      
Director Stock Option Plan [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option or restricted stock grants under 1997, 2000 and 2004 Employee stock option plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, vesting period 5 years      
Stock options granted to employees under 1997, 2000, and 2004 Employee Stock Option Plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, expiration period 10 years      
Director Stock Option Plan [Member] | Restricted stock [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option or restricted stock grants under 1997, 2000 and 2004 Employee stock option plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, vesting period 2 years      
Stock Incentive Plan of 2006 [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option or restricted stock grants under 1997, 2000 and 2004 Employee stock option plans, Independent Director Stock Option Plan, and Stock Incentive Plan of 2006, vesting period 2 years