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Related Party Transactions - Coke Supply Agreement (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
T
$ / T
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]                      
Cost of materials and other | $ $ 21,501 $ 19,495 $ 22,141 $ 21,737 $ 21,552 $ 19,811 $ 36,049 $ 16,381 $ 84,874 $ 93,793 $ 65,189
Liability included in accounts payable | $ 2,223       2,402       2,223 2,402  
CRRM | Coke Supply Agreement | Petroleum coke                      
Related Party Transaction [Line Items]                      
Cost of materials and other | $                 2,000 2,100 $ 6,600
Liability included in accounts payable | $ $ 100       $ 100       $ 100 $ 100  
CRRM | Coke Supply Agreement | CRNF | Petroleum coke                      
Related Party Transaction [Line Items]                      
Percentage of annual production of pet coke to be delivered                 100.00%    
Annual production of pet coke (in tons) | T                 500,000    
Period for which average percentage of product obtained                 5 years    
Rate petroleum coke price used to determine urea ammonium nitrate based price (in dollars per ton)                 25    
UAN-based netback price, exclusive of transportation cost, under the related party agreement (in dollars per ton)                 205    
Pet coke price adjustment for every $1.00 change in the UAN netback price, exclusive of transportation cost, used to calculate the UAN-based price under the related party agreement (in dollars per ton)                 0.5    
UAN-based netback price change, exclusive of transportation cost, under the related party agreement (in dollars per ton)                 1    
Initial term of agreement                 20 years    
Renewal period of agreement                 5 years    
Notice period for termination of agreement                 3 years    
CRRM | Coke Supply Agreement | CRNF | Petroleum coke | Minimum                      
Related Party Transaction [Line Items]                      
Monthly production volume of product which allows for the purchasing party the option to purchase any excess at rates stated in the agreement (in tons) | T                 41,667    
Average percentage of pet coke obtained during the last five years from CRRM's adjacent crude oil refinery (over)                 70.00%    
Rate petroleum coke price used to determine urea ammonium nitrate based price (in dollars per ton)                 5    
CRRM | Coke Supply Agreement | CRNF | Petroleum coke | Maximum                      
Related Party Transaction [Line Items]                      
Rate petroleum coke price used to determine urea ammonium nitrate based price (in dollars per ton)                 40