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Stock-Based Compensation - Restricted Stock Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 22, 2016
Dec. 31, 2016
Dec. 31, 2015
Mar. 01, 2016
Feb. 23, 2009
Restricted Stock          
Restricted stock plan activity, number of shares          
Unvested at beginning of the period (in shares)   121,010      
Granted (in shares)   37,275      
Forfeited / Canceled (in shares)   (12,100)      
Vested (in shares)   (36,400)      
Unvested at end of the period (in shares)   109,785      
Expected to vest (in shares)   95,535      
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested at beginning of the period (in dollars per share)   $ 44.51      
Granted (in dollars per share)   40.86      
Forfeited / Canceled (in dollars per share)   52.78      
Vested (in dollars per share)   47.55      
Unvested at end of the period (in dollars per share)   41.36      
Expected to vest (in dollars per share)   $ 40.55      
Restricted stock plan activity, other disclosures          
Compensation expense   $ 416 $ 451    
Remaining unrecognized compensation expense   $ 2,691      
Weighted average period for recognition   10 months 2 days      
Restricted Stock | Employees          
Restricted stock plan activity, other disclosures          
Repurchase of stock from employees (in shares)   6,017      
Average purchase price (in dollars per share)   $ 44.15      
Restricted Stock | Key employees and non-employee directors          
Restricted stock plan activity, number of shares          
Granted (in shares) 37,275        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Granted (in dollars per share) $ 40.86        
Restricted Stock | 2009 Restricted Stock Plan          
Stock-Based Compensation          
Number of shares authorized under the plan         400,000
Restricted Stock, Restricted Stock Units and Performance Shares          
Stock-Based Compensation          
Number of shares authorized under the plan       275,000  
Time-based vesting | Restricted Stock | Employees          
Stock-Based Compensation          
Award vesting period 3 years        
Time-based vesting | Restricted Stock | Non-employee director | Maximum          
Stock-Based Compensation          
Award vesting period 1 year