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Derivatives Narrative (Details)
bbl in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
bbl
Jun. 27, 2016
5% Convertible Senior Notes due 2021 | Convertible Debt    
Credit Derivatives [Line Items]    
Debt instrument, interest rate   5.00%
Options Collar | Over the Counter    
Credit Derivatives [Line Items]    
Derivative contracts, barrels 52  
Option Collars and Swap | Over the Counter    
Credit Derivatives [Line Items]    
Derivative contracts, barrels 20  
Interest Rate Swap    
Credit Derivatives [Line Items]    
Fixed interest rate 1.10%  
Notional amount | $ $ 200  
Long | Energy Related Derivative | Over the Counter    
Credit Derivatives [Line Items]    
Derivative contracts, barrels 1,050  
Long | Refined Products Inventory | Over the Counter    
Credit Derivatives [Line Items]    
Derivative contracts, barrels 66  
Long | Commodity Contract | Over the Counter    
Credit Derivatives [Line Items]    
Derivative contracts, barrels 305