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Derivative Financial Instruments (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Apr. 13, 2011
CRNF
Term loan facility
Mar. 31, 2013
Commodity derivatives
Mar. 31, 2012
Commodity derivatives
Mar. 31, 2013
Commodity swap
Mar. 31, 2012
Commodity swap
Mar. 31, 2013
Interest rate swap agreements
Mar. 31, 2012
Interest rate swap agreements
Mar. 31, 2013
Designated as hedges
Interest rate swap agreements entered into on June 30, 2011
CRNF
Mar. 31, 2013
Designated as hedges
Interest rate swap agreements entered into on July 1, 2011
CRNF
Mar. 31, 2013
Designated as hedges
Interest rate swap agreements
CRNF
Jul. 01, 2011
Designated as hedges
Interest rate swap agreements
CRNF
agreement
Mar. 31, 2013
Not designated as hedges
Commodity swap
bbl
Dec. 31, 2012
Not designated as hedges
Commodity swap
bbl
Derivative Financial Instruments                              
Realized gain (loss) $ (52,515,000) $ (19,086,000)       $ (50,500,000) $ (10,900,000)                
Unrealized gain (loss) on derivative agreements 32,489,000 (128,167,000)   (200,000) 200,000 32,700,000 (128,300,000) 46,000 200,000            
Total gain (loss) on derivatives, net (20,026,000) (147,253,000)                          
Portion of net unrealized loss in other current liabilities       300,000                      
Number of barrels                           22,800,000 23,300,000
Net unrealized loss                           34,100,000  
Portion of net unrealized loss in current liabilities                           35,500,000  
Portion of net unrealized gain in long-term assets                           1,400,000  
Realized gain (loss)       2,000,000 8,200,000                    
Number of floating-to-fixed interest rate swap agreements                         2    
Borrowing capacity on credit facility     125,000,000                 125,000,000      
Aggregate notional amount                       62,500,000      
Floating rate basis                   Three months LIBOR Three months 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)                       4.58%      
Realized loss on the interest rate swap re-classed from AOCI into interest expense               $ (300,000) $ (200,000)