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Stock Options (Details) (2012 Plan Stock Options, USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Y
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 30, 2011
Stock option details        
Maximum exercisable period for options granted     P10Y  
Shares available for future grants 800,000   800,000  
Stock-based compensation expense $ 122,000 $ 93,000 $ 253,000 $ 195,000
Stock-based compensation cost, unrecognized, related to non-vested options 1,060,000   1,060,000  
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition (in years)     1.8  
Stock option activity        
Options outstanding at the beginning of the period (in shares)     844,721  
Less:        
Options exercised (in shares)     3,165  
Options forfeited (in shares)     36,551  
Options outstanding at the end of the period (in shares) 805,005   805,005  
Options fully vested and exercisable at the end of the period (in shares) 396,672   396,672  
Stock options, weighted average exercise price        
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 19.08  
Less:        
Options exercised, weighted average exercise price (in dollars per share) $ 10.40   $ 10.40  
Options forfeited, weighted average exercise price (in dollars per share) $ 21.43   $ 21.43  
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.01   $ 19.01  
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 23.82   $ 23.82  
Stock options, weighted average remaining contractual term (in years)        
Options outstanding at the end, weighted average remaining contractual term (in years) 4.08   4.08  
Options fully vested and exercisable at the end, weighted average remaining contractual term (in years)     2.11  
Stock options, aggregate intrinsic value        
Options outstanding at the end, aggregate intrinsic value 2,825,000   2,825,000  
Options fully vested and exercisable at the end, aggregate intrinsic value $ 526,000   $ 526,000  
Incentive stock options granted to 10% shareholders
        
Stock option details        
Maximum exercisable period for options granted     P5Y