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Share-Based Compensation (Details) (USD $) | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |
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Oct. 31, 2007 CALLC Pre Split entity | May 31, 2011 CALLC -Post Split | Feb. 28, 2011 CALLC -Post Split | Feb. 28, 2011 CALLC II | Mar. 31, 2011 CALLC and CALLC II | Jun. 30, 2005 Override Value Units (a) CALLC and CALLC II | Mar. 31, 2012 Override Value Units (a) CALLC and CALLC II | Dec. 31, 2006 Override Value Units (b) CALLC and CALLC II | Mar. 31, 2012 Override Value Units (b) CALLC and CALLC II | Feb. 29, 2008 Override Units (c) CALLC III | Mar. 31, 2012 Override Units (c) CALLC III | Mar. 31, 2011 Override Units (c) CALLC and CALLC II | Mar. 31, 2012 Override Units (c) CALLC and CALLC II
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities into which the limited liability company was split | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock sold pursuant to a registered public offering |  | 7,988,179 | 11,759,023 | 15,113,254 |  |  |  |  |  |  |  |  |
Key information for the share-based compensation plans related to the override units of CALLC, CALLC II and CALLC III |  |  |  |  |  |  |  |  |  |  |  |  |
Benchmark Value (per unit) |  |  |  |  |  |  | $ 11.31 |  | $ 34.72 |  |  |  | $ 10.00
Original Award Issued (in shares) |  |  |  |  |  | 1,839,265 |  | 144,966 |  | 642,219 |  |  |
Compensation Expense Increase (Decrease) |  |  |  |  | $ 5,637,000 |  | $ 4,987,000 |  | $ 515,000 |  |  | $ 135,000 |
Valuation Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |
Derived service period (in years) |  |  |  |  |  |  | 6 years |  | 6 years |  |  |  |
CVR closing stock price (in dollars per share) |  |  |  |  |  |  | $ 23.16 |  | $ 23.16 |  |  |  |
Estimated fair value (per unit) |  |  |  |  |  |  | $ 22.61 |  | $ 13.70 |  | $ 2.82 |  |
Marketability and minority interest discounts (as a percent) |  |  |  |  |  |  | 5.00% |  | 5.00% |  | 5.00% |  |
Volatility (as a percent) |  |  |  |  |  |  | 47.10% |  | 47.10% |  | 47.00% |  |
Information of all overrides value units that are initially subject to forfeiture |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated grant date fair value |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |
Number of units vested upon issuance (in shares) |  |  |  |  |  |  |  |  |  | 109,720 |  |  |

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- Definition Estimated fair value of equity-based awards outstanding at the end of reporting period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(d) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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