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Share-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Feb. 28, 2013
Incentive award
Feb. 29, 2012
Incentive award
Jun. 30, 2013
Stock Options
Jun. 30, 2012
Stock Options
Jun. 30, 2013
Restricted Stock
Share-Based Compensation                  
Total compensation expense recognized for share-based compensation (in dollars) $ 106,000 $ 120,000 $ 215,000 $ 267,000          
Tax benefit or expense related to compensation expense 0 0 0 0          
Historical annual forfeiture rates (as a percent) 3.00% 3.30% 3.00% 3.30%          
Share-Based Compensation                  
Incentive bonus on meeting certain performance metrics (in dollars)         133,100 150,300      
Common stock issued (in shares)         33,187 39,294      
Summary of stock option award activity                  
Outstanding at the beginning of the period (in shares)             79,000    
Forfeited or cancelled (in shares)             (19,000)    
Outstanding at the end of the period (in shares)             60,000    
Exercisable at the end of the period (in shares)             55,000    
Expected to vest at the end of the period (in shares)             3,600    
Weighted Average Exercise Price                  
Outstanding at the beginning of the period (in dollars per share)             $ 23.52    
Forfeited or cancelled (in dollars per share)             $ 35.82    
Outstanding at the end of the period (in dollars per share)             $ 19.63    
Exercisable at the end of the period (in dollars per share)             $ 20.94    
Expected to vest at the end of the period (in dollars per share)             $ 5.20    
Weighted Average Grant-Date Fair Value                  
Forfeited or cancelled (in dollars per share)             $ 12.29    
Outstanding at the end of the period (in dollars per share)             $ 7.33    
Exercisable at the end of the period (in dollars per share)             $ 7.77    
Expected to vest at the end of the period (in dollars per share)             $ 2.48    
Weighted Average Remaining Contractual Term                  
Outstanding at the end of the period             3 years 10 months 24 days    
Exercisable at the end of the period             3 years 8 months 12 days    
Expected to vest at the end of the period             5 years 8 months 12 days    
Additional disclosure                  
Granted (in shares)             0 0  
Exercised (in shares)             0 0  
Fair value of shares vested (in dollars)             12,000 79,000  
Total unamortized compensation expense (in dollars)             $ 9,000    
Weighted average period for recognition of unamortized compensation expense             7 months 6 days    
Summary of restricted stock activity                  
Nonvested balance at the beginning of the period (in shares)                 94,137
Granted (in shares)                 12,000
Vested (in shares)                 (37,546)
Nonvested balance at the end of the period (in shares)                 68,591
Weighted Average Grant-Date Fair Value                  
Nonvested balance at the beginning of the period (in dollars per share)                 $ 5.56
Granted (in dollars per share)                 $ 4.35
Vested (in dollars per share)                 $ 4.74
Nonvested balance at the end of the period (in dollars per share)                 $ 5.74