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Stock Options (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Apr. 05, 2012
Employee Stock Option [Member]
          
Stock option details          
Maximum exercisable period for options granted     10 years    
Shares available for future grants 211,500   211,500   800,000
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)     30,392    
Options expired (in shares)     11,825    
Options forfeited (in shares)     19,775    
Options outstanding at the end of the period (in shares) 1,002,901   1,002,901    
Options fully vested and exercisable at the end of the period (in shares) 230,006   230,006    
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)     $ 13.36    
Options expired, weighted average exercise price (in dollars per share)     $ 26.70    
Options forfeited, weighted average exercise price (in dollars per share)     $ 18.60    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 18.86   $ 18.86    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 17.08   $ 17.08    
Stock options, weighted average remaining contractual term          
Options outstanding at the end, weighted average remaining contractual term     6 years 9 months 7 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term     2 years 1 month 6 days    
Stock options, aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 7,011,000   $ 7,011,000    
Options fully vested and exercisable at the end, aggregate intrinsic value 2,057,000   2,057,000    
Stock-based compensation expense 301,000 101,000 766,000 322,000  
Stock-based compensation cost, unrecognized, related to non-vested options $ 4,226,000   $ 4,226,000    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     2 years 4 months 24 days    
Incentive Stock Options to 10 Percent Shareholders [Member]
          
Stock option details          
Maximum exercisable period for options granted     5 years