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Debt Narrative - Debt and Credit Facilities - Energy (Details) (Energy Segment [Member], USD $) |  |  |  |  |  |  | 0 Months Ended |  |  |
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Jun. 30, 2012 ABL Credit Facility [Member] Revolving Credit Facility [Member] | Apr. 06, 2010 CVR Issuers [Member] CVR First Lien Notes [Member] Term Loan [Member] | Apr. 06, 2010 CVR Issuers [Member] CVR Second Lien Notes [Member] Term Loan [Member] | Dec. 15, 2011 CVR Issuers [Member] Additional CVR Notes [Member] Term Loan [Member] | Jun. 30, 2012 CRLLC [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Dec. 15, 2011 CRLLC [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Feb. 22, 2011 CRLLC [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Feb. 22, 2011 CRLLC [Member] ABL Credit Facility [Member] Letter of Credit [Member] | Feb. 22, 2011 CRLLC [Member] Terminated First Priority Credit Facility, Replaced by ABL Credit Facility [Member] Revolving Credit Facility [Member] | Jun. 04, 2012 CRLLC [Member] Debt repurchase percentage of principal amount authorized if change of control [Member] CVR Notes [Member] Term Loan [Member] | May 04, 2012 CRLLC [Member] Debt repurchase percentage of principal amount authorized if change of control [Member] CVR Notes [Member] Term Loan [Member] | Jun. 30, 2012 CRLLC [Member] LIBOR [Member] Minimum [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Jun. 30, 2012 CRLLC [Member] LIBOR [Member] Maximum [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Jun. 30, 2012 CRLLC [Member] Base Rate [Member] Minimum [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Jun. 30, 2012 CRLLC [Member] Base Rate [Member] Maximum [Member] ABL Credit Facility [Member] Revolving Credit Facility [Member] | Apr. 13, 2011 CRNF [Member] Term Loan [Member] | Apr. 13, 2011 CRNF [Member] Revolving Credit Facility [Member] | Jun. 30, 2012 CRNF [Member] Base Rate [Member] | Jun. 30, 2012 CRNF [Member] EuroDollar [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  | $ 275,000,000 | $ 225,000,000 | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |
Interest rate, long-term debt |  | 9.00% | 10.875% | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  |  |  |  | 54,000,000 |  |  |  |  |  |  |  |
Redemtion percentage of principal amount |  |  |  |  |  |  |  |  |  | 101.00% | 101.00% |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  | 400,000,000 | 250,000,000 |  | 150,000,000 |  |  |  |  |  |  |  | 25,000,000 |  |
Letters of credit sublimit as a percentage of total facility commitment |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, potential increase in maximum borrowing capacity if covenant requirements met |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Availability under ABL credit facility | 347,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 53,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding borowings |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage spread on debt |  |  |  |  |  |  |  |  |  |  |  | 2.75% | 3.00% | 1.75% | 2.00% |  |  | 2.50% | 3.50%

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Letters of Credit Sublimit as a Percentage of Total Facility Commitment + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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