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Debt - Principal Payment Schedule (Details) - USD ($)
Sep. 30, 2020
Sep. 30, 2019
May 14, 2018
Jul. 31, 2017
Debt Instrument [Line Items]        
Total $ 317,122,000      
Less Than 1 Year 213,000      
1 - 3 Years 427,000      
3 - 5 Years 316,482,000      
2024 Convertible Notes        
Debt Instrument [Line Items]        
Total       $ 143,750,000
Stated interest rate       2.875%
Senior Notes | 2024 Convertible Notes        
Debt Instrument [Line Items]        
Total 143,750,000      
Less Than 1 Year 0      
1 - 3 Years 0      
3 - 5 Years 143,750,000      
Senior Notes | 2025 Convertible Notes        
Debt Instrument [Line Items]        
Total 172,500,000   $ 172,500,000  
Less Than 1 Year 0      
1 - 3 Years 0      
3 - 5 Years 172,500,000      
Stated interest rate     2.375%  
Unsecured Notes | 8.5% unsecured debt due 2024        
Debt Instrument [Line Items]        
Total 872,000      
Less Than 1 Year 213,000      
1 - 3 Years 427,000      
3 - 5 Years $ 232,000      
Stated interest rate 8.50% 8.50%