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Debt - Schedule of Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
May 14, 2018
Jul. 31, 2017
Jun. 30, 2014
Debt Instrument [Line Items]          
Gross Amount $ 317,976 $ 515,106      
Debt Discount and Issuance Costs (79,382) (98,223)      
Carrying Amount 238,594 416,883      
Less current portion, Gross Amount 214 197,748      
Less current portion, Debt Discount and Issuance Costs 0 (7,567)      
Less current portion, Carrying Amount 214 190,181      
Total long-term debt, Gross Amount 317,762 317,358      
Total long-term debt, Debt Discount and Issuance Costs (79,382) (90,656)      
Total long-term debt, Carrying Amount 238,380 226,702      
2019 Convertible Notes          
Debt Instrument [Line Items]          
Stated interest rate         2.125%
2024 Convertible Notes          
Debt Instrument [Line Items]          
Stated interest rate       2.875%  
Senior Notes | 2019 Convertible Notes          
Debt Instrument [Line Items]          
Gross Amount 0 195,000      
Debt Discount and Issuance Costs 0 (7,567)      
Carrying Amount 0 187,433      
Senior Notes | 2019 Convertible Notes Embedded Derivative          
Debt Instrument [Line Items]          
Gross Amount 0 2,552      
Debt Discount and Issuance Costs 0 0      
Carrying Amount 0 2,552      
Senior Notes | 2024 Convertible Notes          
Debt Instrument [Line Items]          
Gross Amount 143,750 143,750      
Debt Discount and Issuance Costs (32,439) (37,892)      
Carrying Amount 111,311 105,858      
Senior Notes | 2025 Convertible Notes          
Debt Instrument [Line Items]          
Gross Amount 172,500 172,500      
Debt Discount and Issuance Costs (46,290) (52,764)      
Carrying Amount 126,210 119,736 $ 121,300    
Stated interest rate     2.375%    
Unsecured Notes | 8.5% unsecured debt due 2024          
Debt Instrument [Line Items]          
Gross Amount 1,092 1,304      
Debt Discount and Issuance Costs 0 0      
Carrying Amount $ 1,092 1,304      
Stated interest rate 8.50%        
Receivables Securitization Facility | CASHMAX secured borrowing facility          
Debt Instrument [Line Items]          
Gross Amount $ 634 0      
Debt Discount and Issuance Costs (653) 0      
Carrying Amount $ (19) $ 0