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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEMBERS'/SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Members' Equity
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in Shares/Units) at Sep. 30, 2020   1,555 0    
Beginning balance at Sep. 30, 2020 $ 0 $ 166,617 $ 0 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common units under long-term incentive plan (in Shares/Units)   13      
Dividends on preferred units (917) $ (917)      
Dividends on common units   (3,801)      
Unit-based compensation expense   413      
Net income (loss) (7,941) $ (7,941)      
Ending balance (in Shares/Units) at Dec. 31, 2020   1,568 0    
Ending balance at Dec. 31, 2020 0 $ 154,371 $ 0 0 0
Beginning balance (in Shares/Units) at Sep. 30, 2021   0 19,672    
Beginning balance at Sep. 30, 2021 221,690 $ 0 $ 20 270,837 (49,167)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation expense 919     919  
Repurchased shares for tax withholding (in shares)     (10)    
Repurchased shares for tax withholding (19)     (19)  
Issuance of common units under long-term incentive plan (in Shares/Units)     175    
Dividends on preferred units 0        
Dividends declared (6,150)       (6,150)
Net income (loss) 21,398       21,398
Ending balance (in Shares/Units) at Dec. 31, 2021   0 19,837    
Ending balance at Dec. 31, 2021 $ 237,838 $ 0 $ 20 $ 271,737 $ (33,919)