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Long-Term Debt - Schedule of Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
May 14, 2018
Sep. 30, 2017
Jul. 31, 2017
Jun. 30, 2014
Debt Instrument [Line Items]          
Gross Amount $ 515,106   $ 345,341    
Debt Discount and Issuance Costs (98,223)   (60,534)    
Carrying Amount 416,883   284,807    
Less current portion, Gross Amount 197,748   0    
Less current portion, Debt Discount and Issuance Costs (7,567)   0    
Less current portion, Carrying Amount 190,181   0    
Total long-term debt, Gross Amount 317,358   345,341    
Total long-term debt, Debt Discount and Issuance Costs (90,656)   (60,534)    
Total long-term debt, Carrying Amount 226,702   284,807    
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 195,000   195,000    
Debt Discount and Issuance Costs (7,567)   (17,654)    
Carrying Amount 187,433   177,346    
Senior Notes | 2019 Convertible Notes Embedded Derivative          
Debt Instrument [Line Items]          
Gross Amount 2,552   6,591    
Debt Discount and Issuance Costs 0   0    
Carrying Amount 2,552   6,591    
Senior Notes | 2024 Convertible Notes          
Debt Instrument [Line Items]          
Gross Amount 143,750   143,750    
Debt Discount and Issuance Costs (37,892)   (42,880)    
Carrying Amount 105,858   100,870    
Senior Notes | 2025 Convertible Notes          
Debt Instrument [Line Items]          
Gross Amount 172,500   0    
Debt Discount and Issuance Costs (52,764)   0    
Carrying Amount 119,736 $ 121,300 0    
Stated interest rate   2.375%      
Unsecured Notes | 8.5% unsecured notes due 2024          
Debt Instrument [Line Items]          
Gross Amount 1,304   0    
Debt Discount and Issuance Costs 0   0    
Carrying Amount $ 1,304   $ 0    
Stated interest rate 8.50%