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Derivative Financial Instruments (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
CRNF
Term loan facility
Mar. 31, 2014
Commodity derivatives
Mar. 31, 2013
Commodity derivatives
Mar. 31, 2014
Commodity swap
Mar. 31, 2013
Commodity swap
Mar. 31, 2014
Interest rate swap
Mar. 31, 2013
Interest rate swap
Mar. 31, 2014
Not designated as hedges
Commodity swap
bbl
Dec. 31, 2013
Not designated as hedges
Commodity swap
bbl
Mar. 31, 2014
Designated as hedges
Interest rate swap agreements entered into on June 30, 2011
CRNF
Mar. 31, 2014
Designated as hedges
Interest rate swap
CRNF
agreement
Jul. 01, 2011
Designated as hedges
Interest rate swap
CRNF
agreement
Jun. 30, 2011
Designated as hedges
Interest rate swap
CRNF
agreement
Mar. 31, 2014
Designated as hedges
Interest rate swap agreements entered into on July 1, 2011
CRNF
Derivative Financial Instruments                                
Current period settlements on derivative contracts $ 21,100,000 $ (52,500,000)                            
Gain (loss) on derivatives, net 109,400,000 (20,000,000)   (100,000) (2,200,000) 109,500,000 (17,800,000)                  
Number of barrels                   18,100,000 23,300,000          
Unrealized gain                   72,200,000            
Portion of net unrealized gain in current assets                   70,700,000            
Portion of net unrealized gain in non-current assets                   1,500,000            
Number of floating-to-fixed interest rate swap agreements                         2 1 1  
Borrowing capacity on credit facility     125,000,000.0                          
Aggregate notional amount                         62,500,000.0      
Floating rate basis                       three month LIBOR       three month LIBOR
Fixed rate (as a percent)                       1.94%       1.975%
Settlement period                       90 days       90 days
Average fixed rate of interest (as a percent)                         1.96%      
Effective rate (as a percent)                         4.56%      
Realized loss on the interest rate swap re-classed from AOCI into interest expense               $ 300,000 $ 300,000