Quarterly report pursuant to Section 13 or 15(d)

SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes, Net (Details)

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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 1,094,146 $ 1,093,173
Net debt issuance costs [1] (9,487) (10,745)
Senior Notes [Member] | 4.50% senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 175,000 $ 175,000
Debt instrument, stated rate (percent) 4.50% 4.50%
Senior Notes [Member] | 7.15% senior notes due 2020 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 302,133 $ 302,418
Debt instrument, stated rate (percent) 7.15% 7.15%
Unamortized premium $ 2,133 $ 2,418
Senior Notes [Member] | 7.00% senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 300,000 $ 300,000
Debt instrument, stated rate (percent) 7.00% 7.00%
Senior Notes [Member] | 6.00% senior notes due 2025 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 200,000 $ 200,000
Debt instrument, stated rate (percent) 6.00% 6.00%
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net [2] $ 126,500 $ 126,500
Debt instrument, stated rate (percent) 1.875% 1.875%
[1] As discussed in Note 1, the adoption of ASU 2015-03 resulted in a retrospective reclassification of our debt costs from Prepaids, other assets and goodwill to Senior and convertible senior notes, net on our December 31, 2015 balance sheet in the amount of $10.7 million.
[2] The Convertible Notes may be redeemed by the note-holders on the fifth, tenth and fifteenth anniversary dates of the September 18, 2012 issuance date of the Convertible Notes.