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
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Senior and convertible senior notes, net $ 1,093,659 $ 1,093,173
Net debt issuance costs [1] (10,116) (10,745)
4.50% senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net 175,000 175,000
7.15% senior notes due 2020 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net 302,275 302,418
7.00% senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net 300,000 300,000
6.00% senior notes due 2025 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net 200,000 200,000
1.875% convertible senior notes due 2032 [Member]    
Debt Instrument [Line Items]    
Senior and convertible senior notes, net [2] $ 126,500 $ 126,500
[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 issuance date of the Convertible Notes (September 18, 2012).