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Earnings per Share - Calculation of the Weighted Average Number of Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]                      
Net income (loss) $ 6,450 $ (13,268) $ 10,142 $ 4,684 $ 5,477 $ (365) $ (5,263) $ (7,717) $ 8,008 $ (7,868) $ (32,682)
Less: Preferred stock dividend declared                 (5,264) (5,250) (5,250)
Income (loss) available for distribution                 2,744 (13,118) (37,932)
Income allocated to participating securities                 (1,135) 0 0
Net income (loss) available to common shareholders                 $ 1,609 $ (13,118) $ (37,932)
Weighted average basic shares outstanding (in shares)                 29,812 25,438 25,115
Basic income (loss) per common share (in dollars per share) $ 0.10 $ (0.45) $ 0.18 $ 0.07 $ 0.09 $ (0.07) $ (0.26) $ (0.36) $ 0.05 $ (0.52) $ (1.51)