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Stock Options (Details) (2012 Plan Stock Options, USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Apr. 05, 2012
Stock option details      
Shares available for future grants 757,500   800,000
Maximum exercisable period for options granted 10 years    
Stock option activity      
Options outstanding at the beginning of the period (in shares) 794,877    
Less:      
Options exercised (in shares) 1,043    
Options expired (in shares) 22,343    
Options forfeited (in shares) 14,275    
Options outstanding at the end of the period (in shares) 757,216    
Options fully vested and exercisable at the end of the period (in shares) 382,186    
Stock options, weighted average exercise price      
Options outstanding at the beginning, weighted average exercise price (in dollars per share) $ 19.03    
Less:      
Options exercised, weighted average exercise price (in dollars per share) $ 11.54    
Options expired, weighted average exercise price (in dollars per share) $ 23.50    
Options forfeited, weighted average exercise price (in dollars per share) $ 17.15    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 18.95    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 23.7    
Stock options, weighted average remaining contractual term      
Options outstanding at the end, weighted average remaining contractual term 3 years 7 months 17 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term 1 year 7 months 20 days    
Stock options, aggregate intrinsic value      
Options outstanding at the end, aggregate intrinsic value $ 3,164,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 603,000    
Stock-based compensation expense 114,000 131,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 1,043,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition 1 year 10 months 24 days    
Incentive stock options granted to 10% shareholders
      
Stock option details      
Maximum exercisable period for options granted 5 years