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FAIR VALUE MEASUREMENTS (DETAILS 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Senior notes $ 1,490,198 $ 995,855
Estimate Of Fair Value [Member]
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Senior notes $ 1,568,000 $ 1,073,000