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DEBT Table 3 - GoZone Bonds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Amount outstanding $ 3,613,059 $ 3,014,364
Go Zone Bonds Due June 2038    
Debt Instrument [Line Items]    
Date Issued Jun. 26, 2008  
Maturity Date Jun. 01, 2038  
Amount outstanding $ 55,440  
Amount of Letter of Credit 56,169  
Amount Received From Trustee 55,440  
Amount Remaining in Trust $ 0  
Average Annual Interest Rate 1.80%  
Go Zone Bonds Due July 2040    
Debt Instrument [Line Items]    
Date Issued Jul. 15, 2010  
Maturity Date Jul. 01, 2040  
Amount outstanding $ 100,000  
Amount of Letter of Credit 101,315  
Amount Received From Trustee 100,000  
Amount Remaining in Trust $ 0  
Average Annual Interest Rate 1.70%  
Go Zone Bonds Due October 2040    
Debt Instrument [Line Items]    
Date Issued Oct. 07, 2010  
Maturity Date Oct. 01, 2040  
Amount outstanding $ 50,000  
Amount of Letter of Credit 50,658  
Amount Received From Trustee 43,741  
Amount Remaining in Trust $ 6,546  
Average Annual Interest Rate 1.70%  
Go Zone Bonds Due December 2040    
Debt Instrument [Line Items]    
Date Issued Dec. 29, 2010  
Maturity Date Dec. 01, 2040  
Amount outstanding $ 85,000  
Amount of Letter of Credit 86,118  
Amount Received From Trustee 49,782  
Amount Remaining in Trust $ 35,997  
Average Annual Interest Rate 1.70%  
Go Zone Bonds Due August 2041    
Debt Instrument [Line Items]    
Date Issued Aug. 29, 2011  
Maturity Date Aug. 01, 2041  
Amount outstanding $ 75,000  
Amount of Letter of Credit 75,986  
Amount Received From Trustee 75,000  
Amount Remaining in Trust $ 0  
Average Annual Interest Rate 1.80%  
Total Gulf Opportunity Zone revenue bonds    
Debt Instrument [Line Items]    
Amount outstanding $ 365,440 $ 365,440
Amount of Letter of Credit 370,246  
Amount Received From Trustee 323,963  
Amount Remaining in Trust $ 42,543  
Debt, Weighted Average Interest Rate 0.90%