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Derivative Financial Instruments (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 3 Months Ended |
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 13, 2011 CRNF Term loan facility | Dec. 31, 2012 Derivative agreements | Dec. 31, 2011 Derivative agreements | Dec. 31, 2010 Derivative agreements | Dec. 31, 2012 Commodity derivatives | Dec. 31, 2012 Commodity swap | Dec. 31, 2011 Commodity swap | Dec. 31, 2012 Interest rate swap agreements | Dec. 31, 2011 Interest rate swap agreements | Dec. 31, 2010 Interest rate swap agreements | Dec. 31, 2012 Designated as hedges Interest rate swap agreements entered into on June 30, 2011 CRNF D | Dec. 31, 2012 Designated as hedges Interest rate swap agreements entered into on July 1, 2011 CRNF D | Dec. 31, 2012 Designated as hedges Interest rate swap agreements CRNF agreement | Jul. 01, 2011 Designated as hedges Interest rate swap agreements CRNF agreement | Dec. 31, 2012 Not designated as hedges Commodity derivative contracts entered into during September 2011 bbl | Dec. 31, 2011 Not designated as hedges Commodity derivative contracts entered into during September 2011 bbl | Jun. 30, 2010 Not designated as hedges Interest rate swap agreements CRLLC | Mar. 31, 2010 Not designated as hedges Interest rate swap agreements CRLLC
Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ (137,565,000) | $ (7,182,000) | $ 721,000 |  |  |  |  |  | $ (2,860,000) |  |  |  |  |  |  |  |
Unrealized (loss) | 48,953,000 | (115,699,000) | 46,886,000 | (128,167,000) | 92,063,000 | (9,991,000) | 6,448,000 | (3,258,000) | (148,027,000) | 85,262,000 | 634,000 |  | (148,027,000) | 85,262,000 | (2,196,000) | (800,000) | (147,300,000) | 80,400,000 | 400,000 | 2,400,000 | 2,830,000 |  |  |  |  |  |  |  |
Realized gain (loss) on other derivatives | (57,139,000) | (53,271,000) | (8,069,000) | (19,086,000) | 11,116,000 | 66,000 | 484,000 | (18,848,000) | (137,565,000) | (7,182,000) | (2,139,000) |  |  |  |  |  | 126,600,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Total gain (loss) on derivatives, net |  |  |  |  |  |  |  |  | (285,592,000) | 78,080,000 | (1,505,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of net unrealized loss in other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of barrels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,300,000 | 13,000,000 |  |
Net unrealized loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,800,000 |  |  |
Portion of net unrealized loss in current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,700,000 |  |  |
Net unrealized gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,400,000 |  |
Portion of net unrealized gain in current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,600,000 |  |
Portion of net unrealized gain in long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 | 18,800,000 |  |
Realized gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of floating-to-fixed interest rate swap agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |
Borrowing capacity on credit facility |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |
Aggregate notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,500,000 |  |  |  | 110,000,000 | 180,000,000
Floating rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Three months LIBOR | Three months LIBOR |  |  |  |  | Three months LIBOR |
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.94% | 1.975% |  |  |  |  | 4.195% |
Settlement period (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 | 90 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 400,000 |  |  |  |  |  |  |  |  |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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