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CONVERTIBLE NOTES PAYABLE - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 6 Months Ended
May 31, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2020
USD ($)
day
$ / shares
Dec. 31, 2018
USD ($)
Sep. 10, 2018
USD ($)
May 29, 2014
USD ($)
$ / shares
Debt Instrument [Line Items]            
Debt instrument, repurchase amount     $ 23,400,000      
Issuance of common stock from maturity of the 2019 convertible debt outstanding (in shares) | shares 1.3          
Senior Notes Due 2025            
Debt Instrument [Line Items]            
Debt instrument term     7 years      
Note Purchase Agreement | Senior convertible notes due 2019            
Debt Instrument [Line Items]            
Interest rate percentage           4.50%
Initial conversion price (in dollars per share) | $ / shares           $ 17.41
Credit agreement amount           $ 46,000,000.0
Senior Notes | Senior Notes Due 2025            
Debt Instrument [Line Items]            
Long-term debt, excluding current maturities     $ 276,000,000.0   $ 276,000,000.0  
Interest rate percentage     2.50%   2.50%  
Proceeds from issuance of debt     $ 267,200,000      
Debt instrument, convertible, threshold percentage of stock price trigger     130.00%      
Conversion ratio     0.0257739      
Initial conversion price (in dollars per share) | $ / shares     $ 38.80      
Debt conversion, liability     $ 198,600,000      
Debt conversion, equity     77,400,000      
Debt issuance costs, net     $ 8,800,000      
Debt instrument, interest rate, effective percentage     7.70%      
Debt redeemable upon bankruptcy insolvency     100.00%      
Minimum percentage of holders required to declare redemption     25.00%      
Debt redeemable upon declaration of holders     100.00%      
Senior Notes | Convertible Notes Due 2019            
Debt Instrument [Line Items]            
Interest rate percentage     4.50%      
Debt instrument, repurchase amount       $ 23,400,000    
Debt instrument, convertible, threshold trading days | day     20      
Debt instrument, convertible, threshold consecutive trading days | day     30      
Debt instrument, convertible, threshold percentage of stock price trigger     130.00%      
Debt instrument, convertible, threshold consecutive days measuring period | day     10      
Trading price per principal, percentage     98.00%      
Repayments of debt   $ 40,200,000        
Gain (loss) on extinguishment of debt   $ (17,000,000.0)        
Long-term debt and capital lease obligations $ 22,600,000