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Equity (Schedule of Stock Options Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Number of Shares      
Outstanding, beginning of period (in shares) 750,338    
Granted (in shares) 0    
Exercised (in shares) (157,879)    
Forfeited (in shares) (7,936)    
Expired (in shares) (257,725)    
Outstanding, end of period (in shares) 326,798 750,338  
Exercisable (in shares) 282,378    
Weighted Average Exercise Price      
Outstanding, beginning of period (in usd per share) $ 16.84    
Granted (in usd per share) 0.00    
Exercised (in usd per share) 3.38    
Forfeited (in usd per share) 4.83    
Expired (in usd per share) 22.03    
Outstanding, ending of period (in usd per share) 19.54 $ 16.84  
Exercisable (in usd per share) $ 21.88    
Weighted Average Remaining Contractual Life (in years):      
Outstanding 1 year 11 months 9 days    
Exercisable 11 months 27 days    
Vested and expected to vest      
Number of stock options (in shares) 326,798    
Weighted average exercise price (in usd per share) $ 19.54    
Weighted average remaining contractual term 1 year 11 months 9 days    
Aggregate Intrinsic Value      
Intrinsic value of shares exercised $ 920 $ 87 $ 300
Outstanding 295    
Exercisable 138    
Vested and expected to vest $ 295