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Derivative Financial Instruments - Outstanding derivative financial instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Interest rate swap    
DERIVATIVE FINANCIAL INSTRUMENTS    
Notional amount $ 150,000 $ 150,000
Fair Value $ (19)  
Fix Rate 2.09%  
Interest rate swap one    
DERIVATIVE FINANCIAL INSTRUMENTS    
Notional amount [1] $ 150,000  
Fair Value [1] $ (1,143)  
Fix Rate [1] 2.24%  
Forward contracts    
DERIVATIVE FINANCIAL INSTRUMENTS    
Notional amount $ 5,750  
Fair Value $ (35)  
[1] This swap represents a forward contract and will be effective in November 2019.