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Derivative Financial Instruments (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Derivative agreements | Dec. 31, 2012 Derivative agreements | Dec. 31, 2011 Derivative agreements | Dec. 31, 2013 Commodity derivatives | Dec. 31, 2012 Commodity derivatives | Dec. 31, 2011 Commodity derivatives | Dec. 31, 2013 Commodity swap | Dec. 31, 2012 Commodity swap | Dec. 31, 2011 Commodity swap | Dec. 31, 2013 Interest rate swap agreements | Dec. 31, 2012 Interest rate swap agreements | Dec. 31, 2011 Interest rate swap agreements | Dec. 31, 2013 Not designated as hedges Commodity swap bbl | Dec. 31, 2012 Not designated as hedges Commodity swap bbl | Jun. 30, 2010 Not designated as hedges Interest rate swap agreements CRLLC | Dec. 31, 2013 Designated as hedges Interest rate swap agreements CRNF | Jun. 30, 2011 Designated as hedges Interest rate swap agreements CRNF agreement | Apr. 13, 2011 Designated as hedges Interest rate swap agreements CRNF | Dec. 31, 2013 Designated as hedges Interest rate swap agreements entered into on June 30, 2011 CRNF | Jun. 30, 2011 Designated as hedges Interest rate swap agreements entered into on June 30, 2011 CRNF | Dec. 31, 2013 Designated as hedges Interest rate swap agreements entered into on July 1, 2011 CRNF | Jun. 30, 2011 Designated as hedges Interest rate swap agreements entered into on July 1, 2011 CRNF
Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  |  | $ (6,400,000) | $ 137,600,000 | $ 7,200,000 | $ 6,400,000 | $ (137,600,000) | $ (7,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivatives, net | (115,900,000) | 72,500,000 | 120,500,000 | (20,000,000) | (8,200,000) | (168,900,000) | 38,800,000 | (147,200,000) | 57,100,000 | (285,600,000) | 78,100,000 | 57,100,000 | (285,600,000) | 78,100,000 | (2,900,000) | (11,700,000) | (2,600,000) | 60,100,000 | (273,900,000) | 80,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of barrels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,300,000 | 23,300,000 |  |  |  |  |  |  |  |
Gross Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,100,000 | 66,800,000 |  |  |  |  |  |  |  |
Portion of net unrealized gain in current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Portion of net unrealized gain in long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 900,000 |  |  |  |  |  |  |  |
Portion of net unrealized loss in current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 | 67,700,000 |  |  |  |  |  |  |  |
Portion of net unrealized loss in long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |
Number of floating-to-fixed interest rate swap agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Borrowing capacity on credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000.0 |  |  |  |
Aggregate notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,500,000 |  |  |  |  |
Floating rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Three months LIBOR |  |  |  | three month LIBOR |  | three month 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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.56% |  |  |  |  |  |
Realized loss on the interest rate swap re-classed from AOCI into interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,100,000) | (1,000,000) | (300,000) |  |  |  |  |  |  |  |  |  |
Gain (loss) recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000) | (1,400,000) | (3,100,000) |  |  |  |  |  |  |  |  |  |
Gross Amounts Offsets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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