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Long-Term Debt - Schedule of Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jul. 31, 2017
Sep. 30, 2016
Jun. 30, 2014
Debt Instrument [Line Items]        
Gross Amount $ 345,341   $ 317,692  
Debt Discount and Issuance Costs (60,534)   (34,081)  
Carrying Amount 284,807   283,611  
2.125% Cash Convertible Senior Notes Due 2019        
Debt Instrument [Line Items]        
Gross Amount 195,000   230,000  
Debt Discount and Issuance Costs (17,654)   (32,046)  
Carrying Amount $ 177,346   197,954  
Stated interest rate 2.125% 2.875%   2.125%
Cash Convertible Senior Notes Due 2019 embedded derivative        
Debt Instrument [Line Items]        
Gross Amount $ 6,591   37,692  
Debt Discount and Issuance Costs 0   0  
Carrying Amount 6,591   37,692  
2.875% Convertible Senior Notes, Due 2024        
Debt Instrument [Line Items]        
Gross Amount 143,750   0  
Debt Discount and Issuance Costs (42,880)   0  
Carrying Amount $ 100,870   0  
Stated interest rate 2.875% 2.875%    
Line of Credit | Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Gross Amount $ 0   50,000  
Debt Discount and Issuance Costs 0   (2,035)  
Carrying Amount $ 0   $ 47,965