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Net Income (Loss) Per Common Share - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 11, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock Repurchased During Period, Value $ 10.89 $ 11.41    
Document Period End Date   Mar. 31, 2020    
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01    
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   1,000 1,000  
Performance Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   1,000 500  
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   3,200 3,500  
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   5,600 5,600  
Convertible Series B Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   100    
Call Spread Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Class of Warrant or Right, Outstanding       12,600