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Stock Options (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Apr. 05, 2012
Employee Stock Option [Member]
          
Stock option details          
Shares available for future grants 206,750   206,750   800,000
Maximum exercisable period for options granted     10 years    
Stock option activity          
Options outstanding at the beginning of the period (in shares)     515,143    
Plus: Options granted (in shares)     549,750    
Less:          
Options exercised (in shares)     22,475    
Options forfeited (in shares)     14,025    
Options outstanding at the end of the period (in shares) 1,028,393   1,028,393    
Options fully vested and exercisable at the end of the period (in shares) 248,636   248,636    
Stock options, weighted average exercise price          
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 15.98    
Plus: Options granted, weighted average exercise price (in dollars per share)     $ 21.42    
Less:          
Options exercised, weighted average exercise price (in dollars per share)     $ 12.95    
Options forfeited, weighted average exercise price (in dollars per share)     $ 17.77    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 18.93   $ 18.93    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 17.49   $ 17.49    
Stock options, weighted average remaining contractual term          
Options outstanding at the end, weighted average remaining contractual term     5 years 9 months 15 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     2 years 2 months 27 days    
Stock options, aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 8,303,000   $ 8,303,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 2,369,000   2,369,000    
Stock-based compensation expense 304,000 107,000 465,000 221,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 4,527,000   $ 4,527,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     2 years 6 months    
Incentive Stock Options To10 Percent Shareholders [Member]
          
Stock option details          
Maximum exercisable period for options granted     5 years