Quarterly report pursuant to Section 13 or 15(d)

SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Narrative (Details)

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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 18, 2012
Sep. 30, 2017
Jun. 06, 2017
Dec. 31, 2016
Senior Notes [Member] | 5.125% senior notes due 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 300.0  
Stated interest rate   5.125% 5.125%  
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member]        
Debt Instrument [Line Items]        
Stated interest rate   1.875%   1.875%
Debt instrument, percentage of principal amount due to note-holders 100.00%      
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Repurchase Amount   $ 51.9    
Gain (Loss) on Extinguishment of Debt   $ 0.3