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Stock Options (Details) (2012 Plan Stock Options, USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Apr. 05, 2012
Stock option details          
Shares available for future grants 757,500   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)     5,955    
Options expired (in shares)     22,343    
Options forfeited (in shares)     20,600    
Options outstanding at the end of the period (in shares) 745,979   745,979    
Options fully vested and exercisable at the end of the period (in shares) 416,822   416,822    
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)     $ 10.77    
Options expired, weighted average exercise price (in dollars per share)     $ 23.50    
Options forfeited, weighted average exercise price (in dollars per share)     $ 17.88    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.00   $ 19.00    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 22.71   $ 22.71    
Stock options, weighted average remaining contractual term          
Options outstanding at the end, weighted average remaining contractual term     3 years 4 months 13 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     1 year 7 months 2 days    
Stock options, aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 3,860,000   $ 3,860,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 1,130,000   1,130,000    
Stock-based compensation expense 107,000 122,000 221,000 253,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 936,000   $ 936,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     1 year 9 months 18 days    
Incentive stock options granted to 10% shareholders
          
Stock option details          
Maximum exercisable period for options granted     5 years