Quarterly report pursuant to Section 13 or 15(d)

Investment in Derivative Instruments (Details)

v3.20.4
Investment in Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Realized Gain (Loss) $ (319) $ (25)  
Unrealized Gain (Loss) 1,165 66  
Total Gain (Loss) 846 41  
Net unrealized (loss) position (1,046)   $ (2,211)
Prepaid expenses and other current assets | Commodity Contract      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net unrealized (loss) position 267   0
Other assets | Commodity Contract      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net unrealized (loss) position 175   0
Accrued expense and other current liabilities | Commodity Contract      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net unrealized (loss) position 0   (183)
Other long-term liabilities | Commodity Contract      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net unrealized (loss) position 0   (320)
Other long-term liabilities | Interest Rate Swap      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net unrealized (loss) position (1,488)   $ (1,708)
Cost of revenues      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Realized Gain (Loss) (139) 0  
Unrealized Gain (Loss) 945 0  
Total Gain (Loss) 806 0  
Interest expense, net      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Realized Gain (Loss) (180) (25)  
Unrealized Gain (Loss) 220 66  
Total Gain (Loss) $ 40 $ 41