Related Party Transactions (Details 2)	1 Months Ended	3 Months Ended								12 Months Ended
	Apr. 30, 2011	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) affiliate	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items]
Revenue from related party		$ 84,921,000	$ 78,474,000	$ 119,797,000	$ 73,092,000	$ 66,004,000	$ 49,325,000	$ 80,815,000	$ 93,050,000	$ 356,284,000	$ 289,194,000	$ 298,665,000
Number of parties | affiliate										2
Cost of materials and other		21,552,000	$ 19,811,000	$ 36,049,000	$ 16,381,000	9,495,000	$ 14,501,000	$ 15,424,000	$ 25,769,000	$ 93,793,000	65,189,000	71,952,000
Liability included in accounts payable		2,402,000				1,940,000				2,402,000	1,940,000
Receivables		750,000				883,000				750,000	883,000
Asset included in other non-current assets		598,000				777,000				$ 598,000	777,000
Tail gas | CRNF | CRRM
Related Party Transaction [Line Items]
Initial term of agreement										20 years
Renewal period of agreement										5 years
Notice period for termination of agreement										3 years
Feedstock and Shared Services Agreement | CRNF | CRRM
Related Party Transaction [Line Items]
Related party transaction amount incurred										$ 100,000	200,000
Feedstock and Shared Services Agreement | Hydrogen | CRRM
Related Party Transaction [Line Items]
Cost of materials and other										200,000	0	0
Feedstock and Shared Services Agreement | Hydrogen | CRNF | CRRM
Related Party Transaction [Line Items]
Revenue from related party										3,200,000	11,800,000	10,100,000
Feedstock and Shared Services Agreement | Hydrogen | Accounts Payable | CRRM
Related Party Transaction [Line Items]
Liability included in accounts payable		100,000								100,000
Feedstock and Shared Services Agreement | Hydrogen | Prepaid Expenses and Other Current Assets | CRRM
Related Party Transaction [Line Items]
Receivables						500,000					500,000
Feedstock and Shared Services Agreement | Nitrogen | CRRM
Related Party Transaction [Line Items]
Related party transaction amount incurred										0	0	$ 1,000,000
Feedstock and Shared Services Agreement | Oxygen | CRRM
Related Party Transaction [Line Items]
Related party transaction amount incurred										300,000
Feedstock and Shared Services Agreement | Tail gas | CRNF | CRRM
Related Party Transaction [Line Items]
Receivables		200,000				200,000				200,000	200,000
Period for payment of cost of installation of pipe (in years)	3 years
Percentage of payment agreed to be paid for cost of capital in fourth year	15.00%
Asset included in other non-current assets		600,000				800,000				600,000	800,000
Feedstock and Shared Services Agreement | Products and Services Excluding Hydrogen and Tail Gas | CRRM
Related Party Transaction [Line Items]
Liability included in accounts payable		900,000				700,000				900,000	700,000
Receivables		$ 300,000				$ 200,000				$ 300,000	$ 200,000