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Stock Options (Details) (2005 Plan Stock Options, USD $)
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Y
Stock option details      
Increase in the Number of Authorized Shares 300,000    
Maximum exercisable period for options granted (in years) P10Y    
Shares available for future grants 14,161    
Stock-based compensation expense $ 387,000 $ 534,000 $ 655,000
Stock-based compensation cost, unrecognized, related to non-vested options 1,313,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition (in years) 1.95    
Black-Scholes-Merton option valuation model assumptions      
Expected Life (in years) 6.13   6.13
Dividend yield (as a percent) 2.58%   2.99%
Interest rate (as a percent) 1.39%   2.12%
Volatility (as a percent) 49.21%   41.81%
Stock option activity      
Options outstanding at the beginning of the period (in shares) 764,982    
Plus: Options granted (in shares) 228,750    
Less:      
Options exercised (in shares) 7,185    
Options expired (in shares) 81,218    
Options forfeited (in shares) 60,608    
Options outstanding at the end of the period (in shares) 844,721 764,982  
Options fully vested and exercisable at the end of the period (in shares) 374,352    
Stock options, weighted average exercise price      
Options outstanding at the beginning, weighted average exercise price (in dollars per share) $ 20.65    
Plus: Options granted, weighted average exercise price (in dollars per share) $ 14.75    
Less:      
Options exercised, weighted average exercise price (in dollars per share) $ 17.86    
Options expired, weighted average exercise price (in dollars per share) $ 19.93    
Options forfeited, weighted average exercise price (in dollars per share) $ 21.80    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.08 $ 20.65  
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 24.87    
Stock options, weighted average remaining contractual term (in years)      
Options outstanding at the end, weighted average remaining contractual term (in years) 4.54    
Options fully vested and exercisable at the end, weighted average remaining contractual term (in years) 2.33    
Stock options, aggregate intrinsic value      
Options outstanding at the end, aggregate intrinsic value 2,445,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 244,000    
Non-vested Options      
Non-vested options at the beginning of the period (in shares) 377,544    
Granted (in shares) 228,750    
Vested (in shares) (113,582)    
Forfeited (in shares) (22,343)    
Non-vested options at the end of the period (in shares) 470,369 377,544  
Weighted average grant-date fair value, non-vested options      
Non-vested options at the beginning of the period (in dollars per share) $ 4.48    
Granted (in dollars per share) $ 5.51   $ 3.31
Vested (in dollars per share) $ 5.82    
Forfeited (in dollars per share) $ 4.06    
Non-vested options at the end of the period (in dollars per share) $ 4.68 $ 4.48  
Other information pertaining to option activity      
Weighted average grant date fair value of stock options granted (in dollars per share) $ 5.51   $ 3.31
Total fair value of stock options vested 661,000 551,000 522,000
Total intrinsic value of stock options exercised $ 27,000 $ 2,000 $ 581,000
Incentive stock options granted to 10% shareholders
      
Stock option details      
Maximum exercisable period for options granted (in years) P5Y