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LONG TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of principal payments on the Company's Term Debt
The carrying values of the liability's components are reflected in the Company's accompanying consolidated balance sheets as follows:
 
   
December 31,
  
   
2017
    
2016
  
             
Principal
  
$
215,000
    
$
475,000
  
Less: Debt issuance costs, net of amortization
    
(3,486
)
    
(9,820
)
                 
Net liability carrying amount
  
$
211,514
    
$
465,180
  
Schedule of Component of Term Debt Liability
Interest expense related to the liability is reflected on the accompanying consolidated statements of operations for the years ended December 31:

   
December 31,
  
   
2017
    
2016
  
             
Amortization of debt issuance costs
  
$
6,334
    
$
338
  
Interest expense
    
5,558
      
1,266
  
                 
Total interest expense recognized
  
$
11,892
    
$
1,604
  
                 
 Effective interest rate    
3.30%
      
2.84%
  
Schedule of interest Expense Recognized
In January 2017, the Company issued $287,500 aggregate principal amount of Exchangeable Senior Notes (the “Notes”) due 2024. The following table summarizes some key facts and terms regarding the outstanding exchangeable senior notes:
 
   
Due 2024
  
Issuance date
  
January 18, 2017
  
Maturity date
  
January 15, 2024
  
Principal amount
  
$
287,500
  
Cash coupon rate (per annum)
    
1.25
%
Conversion rate effective September 15, 2023 (per $1000 principal amount)
    
12.026
  
Effective conversion price effective September 15, 2023 (per ADS)
  
$
83.15
  
Schedule of Outstanding Exchangeable Note
The carrying values of the liability and equity components of the exchangeable senior notes are reflected in the Company's accompanying consolidated balance sheets as follows:
 
   
December 31,
  
   
2017
  
       
Principal
  
$
287,500
  
Less:
        
Debt issuance costs, net of amortization
    
(5,182
)
Unamortized discount
    
(46,190
)
Net liability carrying amount
  
$
236,128
  
Equity component - net carrying value
  
$
51,176
  
Schedule of Carring Values
Interest expense related to the notes is reflected on the accompanying consolidated statements of operations for the year ended December 31:
 
   
Year Ended
December 31,
  
   
2017
  
       
Amortization of debt issuance costs
  
$
609
  
Non-cash amortization of debt discount
    
6,278
  
Interest expense
    
3,414
  
Net liability carrying amount
  
$
10,301
  
         
 Equity component - net carrying value    
4.68%