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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Realized gains (losses) on derivatives not designated as hedging instruments

Three Months Ended

Six Months Ended

March 31, 

March 31, 

    

2020

    

2019

    

2020

    

2019

    

Realized gains (losses) on derivatives not designated as hedging instruments

$

4,424

$

(3,831)

$

756

$

(854)