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CONVERTIBLE NOTES (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 18, 2014
USD ($)
Dec. 31, 2016
USD ($)
item
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Gain on repurchase of convertible notes   $ 2,782    
Convertible notes   $ 125,569 $ 146,674  
2014 Notes        
Debt Instrument [Line Items]        
Proceeds from initial issuance of convertible notes $ 130,000      
Period of option for additional issuance 30 days      
Proceeds from additional issuance of convertible notes $ 20,000      
Interest rate (as a percent)   4.25%    
Conversion rate   0.0222222    
Conversion price (in dollars per share) | $ / shares   $ 45.00    
Sales price of common stock as percentage of conversion price for redemption at Company's option   130.00%    
Number of trading days that threshold percentage exceeds stock price for trigger of redemption at Company's option | item   20    
Period of consecutive trading days that the threshold of trading days must fall within for trigger of redemption at Company's option   30 days    
Redemption prices as percentage of outstanding principal amount plus accrued and unpaid interest following occurrence of certain tax related events   100.00%    
Convertible notes repurchased   $ 22,500    
Weighted average price | $ / shares   $ 85.43    
Par value under redemption of convertible notes | $ / shares   $ 100    
Gain on repurchase of convertible notes   $ 2,782    
Convertible notes   125,569 146,674  
Unamortized issuance costs   $ 1,931 43,326  
Effective interest rate (as a percent)   4.98%    
Amortization of financing costs   $ 898 810 $ 794
Interest expense   5,642 6,375  
2014 Notes | Other payables        
Debt Instrument [Line Items]        
Accrued interest   $ 2,008 $ 2,387