v2.4.0.8
DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]      
(Payments for) proceeds from termination of interest rate swaps $ (33,697,000) $ (5,678,000) $ 33,433,000
Volume of commodity contracts (in barrels) 15,200,000 22,700,000  
Margin deposits 3,285,000 6,192,000  
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps (10,700,000)    
Interest rate swaps | Fair Value Hedges
      
Derivative [Line Items]      
New and Terminated Interest Rate Swap, Notional Amount   200,000,000  
New and Terminated Interest Rate Swaps, Hedged Debt Instruments   4.75% senior notes  
Terminated interest rate swaps, notional amount   270,000,000  
Terminated interest rate swaps, hedged debt instruments   4.80% senior notes  
New Interest Rate Swaps, Interest Rate Received   4.75% 4.80%
New Interest Rate Swaps, Pay Rate   variable rate based on one month USD LIBOR plus a percentage that varied with each agreement variable rate based on one month USD LIBOR, plus a percentage that varies with each agreement
(Payments for) proceeds from termination of interest rate swaps   19,700,000  
Notional amount of interest rate swaps 0 0  
Interest rate swaps | Cash Flow Hedges
      
Derivative [Line Items]      
Terminated interest rate swaps, notional amount 275,000,000 225,000,000  
Terminated interest rate swaps, hedged debt instruments 6.05% senior notes due March 15, 2013 and 5.875% senior notes due June 1, 2013 4.75% senior notes  
(Payments for) proceeds from termination of interest rate swaps (33,700,000) (25,400,000)  
Discontinued forward-starting interest rate swaps, Gain (Loss) (2,000,000)    
Notional amount of interest rate swaps 0 275,000,000  
Commodity contracts | Cash Flow Hedges
      
Derivative [Line Items]      
San Antonio Refinery Hedges, Gain (Loss)   (21,700,000) 16,400,000
San Antonio Refinery Hedges, Gain (Loss) Reclassified From AOCI     $ 15,100,000