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FINANCIAL INSTRUMENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended
Jan. 23, 2013
Mar. 31, 2016
Fair Value Measurements    
Closing sale price (in dollars per share)   $ 52.98
Debt Instrument, Convertible, Conversion Premium, Shares   2.5
Estimated conversion value   $ 134,500
Level 1    
Fair Value Measurements    
Convertible senior notes [1]   0
Level 2    
Fair Value Measurements    
Convertible senior notes [1]   262,551
Level 3    
Fair Value Measurements    
Convertible senior notes [1]   0
Carrying Value    
Fair Value Measurements    
Convertible senior notes [1]   $ 105,215
Notes    
Fair Value Measurements    
Initial conversion price of notes into common stock (in dollars per share) $ 24.82  
Maximum    
Fair Value Measurements    
Debt Instrument, Convertible, Conversion Premium, Shares 4.8  
[1] The fair value of the Notes was based on the closing price of the Company’s common stock of $52.98 per share at March 31, 2016 compared to a conversion price of $24.82 per share which, if converted, would result in an approximate conversion premium of 2.5 million shares or $134.5 million of cash. The maximum conversion premium that can be due on the Notes is 4.8 million shares, which assumes no increases in the conversion rate for certain corporate events.