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CONVERTIBLE NOTES - 6.00% Convertible Senior Notes (Details) - USD ($)
1 Months Ended 6 Months Ended
Feb. 19, 2015
Aug. 31, 2016
Dec. 31, 2016
Oct. 31, 2015
Debt Instrument [Line Items]        
Fixed interest rate       1.15%
Common Stock        
Debt Instrument [Line Items]        
Shares issued in settlement of debt (shares)   34,659,972    
Convertible Notes | 6.00% Convertible Senior Notes due 2020        
Debt Instrument [Line Items]        
Fixed interest rate 6.00% 6.00%    
Principal value of the liability component $ 65,000,000      
Percentage of stock price the Notes were sold 100.00%      
Proceeds from the sale of convertible notes, net $ 61,600,000      
Unamortized value of the debt discount and issuance costs 3,400,000      
Offering expenses $ 600,000      
Payment on 6% Notes   $ 4,700,000    
Convertible Notes | 6.00% Convertible Senior Notes due 2020 | Interest Income (Expense), Net        
Debt Instrument [Line Items]        
Interest make-whole charge     $ 5,900,000  
Convertible Notes | 6.00% Convertible Senior Notes due 2020 | Other Income (Expense), Net        
Debt Instrument [Line Items]        
Induced conversion expense     $ 7,400,000