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Stock Plans - Narrative (Details) - USD ($)
3 Months Ended
May 24, 2016
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   $ 463,000 $ 456,000
Intrinsic value of options exercised   $ 768,000 $ 508,000
Stock options granted (in shares)   0 0
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   $ 433,000 $ 414,000
Unrecognized compensation costs, stock options   $ 8,000,000  
Unrecognized compensation costs period recognized   2 years 7 months 24 days  
Market Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs period recognized   2 years 9 months 2 days  
Minimum required consecutive trading days that common stock must close at or above required share price (in days) 20 days    
Share-based compensation expense   $ 972,000 1,200,000
Unrecognized compensation costs   $ 14,100,000  
Market Restricted Stock | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share price threshold for performance criteria (in dollars per share) $ 34.00    
Market Restricted Stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share price threshold for performance criteria (in dollars per share) $ 38.00    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs period recognized   4 years 8 months 12 days  
Share-based compensation expense   $ 915,000 159,000
Unrecognized compensation costs   3,600,000  
2015 Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common voting shares authorized (in shares) 7,000,000    
Options or restricted shares of expiration period (in years) 10 years    
Percentage of fair market value of common stock 100.00%    
Option vesting period (in years) 3 years    
Employee Stock Purchase Plan | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   29,000 $ 43,000
Maximum annual purchase per employee   $ 25,000  
Purchase date discount   15.00%