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Earnings per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]        
Net income (loss) $ 5,330 $ (40,874) $ 9,629 $ (39,636)
Earnings per common share        
Average common share outstanding (denominator) (in shares) 55,661 55,448 55,509 55,557
Earnings per common share (in dollars per share) $ 0.10 $ (0.74) $ 0.17 $ (0.71)
Diluted earnings per common share        
Average common share outstanding (in shares) 55,661 55,448 55,509 55,557
Dilutive effect of restricted stock and convertible notes (in shares) 4 74 2 51
Diluted average common shares outstanding (denominator) (in shares) 55,665 55,522 55,511 55,608
Diluted earnings per common share (in dollars per share) $ 0.10 $ (0.74) $ 0.17 $ (0.71)
Potential common shares excluded from the calculation of diluted earnings per share above, Restricted stock (in shares) 964 2,777 831 2,495