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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Convertible Debt (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 17, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jul. 25, 2017
$ / shares
Dec. 31, 2018
USD ($)
shares
days
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Principal       $ 386,843    
Debt instrument, convertible, threshold percentage of conversion price trigger for redemption       130.00%    
Debt instrument, convertible, threshold trading days for redemption | days       20    
Debt Instrument, Convertible, Threshold Consecutive Trading Days for redemption       30 days    
Issuance of convertible debt, net of issuance costs       $ 0 $ 222,311 $ 0
Percentage of the maximum number of shares authorized for issuance       40.00%    
Percentage of maximum number of shares that would require cash settlement       60.00%    
Fair value of similar notes without conversion feature   $ 194,200        
Fair value of convertible debt conversion feature   35,800        
Tax impact of convertible debt embedded derivative liability reclassification to equity $ 7,800          
(Loss) gain on convertible debt embedded derivative       $ (24,783) 818 0
Carrying amount of convertible debt equity component, before issuance costs   $ 14,400        
Issuance costs, allocated to equity           $ 100
Convertible debt, remaining amortization period       55 months    
Convertible debt            
Debt Instrument [Line Items]            
Principal       $ 230,000 230,000  
Interest rate on convertible debt   5.00%   5.00%    
Initial conversion rate, convertible debt       46.0829    
Initial conversion price, convertible debt | $ / shares       $ 21.70    
Conversion premium     40.00%      
Share Price | $ / shares     $ 15.50      
Debt Instrument, Convertible, Threshold Trading Days | days       20    
Debt Instrument, Convertible, Threshold Consecutive Trading Days | days       30    
Debt Instrument, Convertible, Threshold Percentage of Conversion Price Trigger       130.00%    
Number of business days after the specified trading price criteria met that notes may be converted | days       5    
Consecutive trading days, trading price criteria       5 days    
Convertible debt, threshold percentage, product of common stock price and conversion price       98.00%    
Shares outstanding, percentage threshold       19.99%    
Convertible debt, threshold shares, approval of shareholders | shares       5,964,858    
Number of shares into which debt is convertible | shares       10,599,067    
Debt Instrument, Redemption Price, Percentage       100.00%    
Issuance of convertible debt, net of issuance costs   $ 222,300        
Embedded derivative liability   21,400   $ 0 [1] 20,594 [1]  
Debt discount   35,800   $ 28,982 33,882  
Debt Instrument, Term       72 months    
Total issuance costs associated with the Notes       $ 7,700    
Convertible debt issuance costs, allocated to debt       7,200    
Issuance costs, allocated to equity       $ 500    
Convertible debt | Maximum            
Debt Instrument [Line Items]            
Number of shares into which debt is convertible | shares       14,838,703    
Number of shares that would require cash settlement | shares       8,873,845    
Term Loan Facility            
Debt Instrument [Line Items]            
Repayment of term loan   160,000        
Debt Instrument, Term       5 years    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Repayments of outstanding borrowings on revolving credit facility   $ 62,300        
Debt Instrument, Term       5 years    
Credit Facility | Not Designated as Hedging Instrument [Member]            
Debt Instrument [Line Items]            
Embedded derivative liability $ 45,400     $ 0 $ 20,594  
[1] The embedded derivative liability was reclassified to stockholders’ equity as of May 17, 2018 and is no longer marked to fair value each period, as discussed further below. It is excluded from the table above as of December 31, 2018.