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Stock Based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized         3,000,000  
Tax benefit recorded to additional paid in capital     $ 148,000      
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Tax benefit recorded to additional paid in capital     $ 145,000 $ 58,000    
Unrecognized compensation expense   $ 1,080,000   $ 1,080,000 $ 1,449,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     1 year 8 months 10 days      
Restricted Stock Rollforward, Shares            
Unvested balance at December 31, 2013     104,068      
Granted     55,029      
Vested     (46,629)      
Forfeited     0      
Unvested balance at Period End 112,468   112,468      
Weighted Average Grant Date Fair Value of Restricted Stock            
Unvested balance at December 31, 2013, USD per share $ 17.01   $ 17.01   $ 17.01 $ 10.79
Granted, USD per share     24.39      
Vested, USD per share     11.82      
Forfeited, USD per share     0.00      
Unvested balance at Period End, USD per share $ 17.01   $ 17.01      
Shares Paid for Tax Withholding for Share Based Compensation     12,141 14,429    
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation costs $ 183,000 $ 135,000 $ 609,000 $ 439,000    
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation costs     0      
Tax benefit related to disqualified dispositions     8,000 311,000    
Credit to income tax expense     5,000 84,000    
Tax benefit recorded to additional paid in capital     $ 3,000 $ 227,000    
Stock Options Rollforward, Shares            
Outstanding at December 31, 2013     3,000      
Exercised     (3,000)      
Granted     0      
Forfeited     0      
Outstanding at Period End 0   0      
Weighted Average Exercise Price of Stock Options            
Outstanding at December 31, 2013, USD per share     $ 6.40      
Exercised, USD per share     6.40      
Granted, USD per share     0.00      
Forfeited, USD per share     0.00      
Outstanding at Period End, USD per share $ 0.00   $ 0.00