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LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2013
Debt instrument        
Notes payable, gross $ 3,872,488      
Credit Facility due September 30, 2020 472,488 $ 166,000    
Unamortized discounts and debt issuance costs (28,176) (31,382)    
Total debt 3,844,312 3,534,618    
Less: Current portion of line of credit (111,488) (166,000)    
Long-term debt $ 3,732,824 3,368,618    
5.125% Notes due July 1, 2017        
Debt instrument        
Debt instrument, stated percentage rate 5.125%      
Notes payable, gross $ 125,000 125,000    
6.050% Notes due January 15, 2018        
Debt instrument        
Debt instrument, stated percentage rate 6.05%      
Notes payable, gross $ 300,000 300,000    
2.650% Notes due November 15, 2018        
Debt instrument        
Debt instrument, stated percentage rate 2.65%      
Notes payable, gross $ 400,000 400,000    
5.500% Notes due August 15, 2019        
Debt instrument        
Debt instrument, stated percentage rate 5.50%      
Notes payable, gross $ 275,000 275,000    
4.875% Notes due February 1, 2021        
Debt instrument        
Debt instrument, stated percentage rate 4.875%      
Notes payable, gross $ 650,000 650,000    
4.150% Notes due July 1, 2023        
Debt instrument        
Debt instrument, stated percentage rate 4.15%     4.15%
Notes payable, gross $ 500,000 500,000    
4.350% Notes due October 15, 2024        
Debt instrument        
Debt instrument, stated percentage rate 4.35%   4.35%  
Notes payable, gross $ 300,000 300,000    
6.750% Notes due August 15, 2033        
Debt instrument        
Debt instrument, stated percentage rate 6.75%      
Notes payable, gross $ 150,000 150,000    
5.850% Notes due November 15, 2043        
Debt instrument        
Debt instrument, stated percentage rate 5.85%      
Notes payable, gross $ 400,000 400,000    
5.600% Notes due October 15, 2044        
Debt instrument        
Debt instrument, stated percentage rate 5.60%   5.60%  
Notes payable, gross $ 300,000 $ 300,000