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Stock-Based Compensation - Restricted Stock Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Nov. 22, 2016
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 01, 2016
Feb. 23, 2009
Restricted Stock                
Restricted stock plan activity, number of shares                
Unvested at beginning of the period (in shares)     107,210   107,210      
Granted (in shares)         31,750      
Forfeited / Canceled (in shares)         (14,550)      
Vested (in shares)         (26,875)      
Unvested at end of the period (in shares)   97,535     97,535      
Expected to vest (in shares)   84,868     84,868      
Restricted stock plan activity, Weighted Average Fair Value at Grant Date                
Unvested at beginning of the period (in dollars per share)     $ 41.36   $ 41.36      
Granted (in dollars per share)         31.76      
Forfeited / Canceled (in dollars per share)         46.57      
Vested (in dollars per share)         44.51      
Unvested at end of the period (in dollars per share)   $ 36.59     36.59      
Expected to vest (in dollars per share)   $ 36.42     $ 36.42      
Restricted stock plan activity, other disclosures                
Compensation expense   $ 251   $ 451 $ 565 $ 866    
Remaining unrecognized compensation expense   $ 1,695     $ 1,695      
Weighted average period for recognition         1 year 2 months 5 days      
Restricted Stock | Employees                
Restricted stock plan activity, other disclosures                
Repurchase of stock from employees (in shares)     6,937          
Average purchase price (in dollars per share)     $ 32.23          
Restricted Stock | 2009 Restricted Stock Plan                
Stock-Based Compensation                
Number of shares authorized under the plan               400,000
Deferred Restricted Stock                
Restricted stock plan activity, number of shares                
Granted (in shares)         16,550      
Unvested at end of the period (in shares)   16,550     16,550      
Expected to vest (in shares)   16,550     16,550      
Restricted stock plan activity, Weighted Average Fair Value at Grant Date                
Granted (in dollars per share)         $ 31.76      
Unvested at end of the period (in dollars per share)   $ 31.76     31.76      
Expected to vest (in dollars per share)   $ 31.76     $ 31.76      
Restricted stock plan activity, other disclosures                
Compensation expense   $ 131   $ 0 $ 175 $ 0    
Remaining unrecognized compensation expense   $ 350     $ 350      
Weighted average period for recognition         8 months 1 day      
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