Quarterly report pursuant to Section 13 or 15(d)

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

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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes, Net (Parenthetical) (Details) - Senior Notes [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
4.50% senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated rate 4.50% 4.50%
7.15% senior notes due 2020 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated rate 7.15% 7.15%
Unamortized premium $ 2,275 $ 2,418
7.00% senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated rate 7.00% 7.00%
6.00% senior notes due 2025 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated rate 6.00% 6.00%
1.875% convertible senior notes due 2032 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated rate 1.875% 1.875%