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Equity Cash distributions (Details) (USD $)	2 Months Ended	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2013
Distribution Made to Member or Limited Partner [Line Items]
Distribution Made to Member or Limited Partner, Cash Distributions Declared		$ 9,429,000
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit	$ 1.50	$ 1.54
Distribution Made to Member or Limited Partner, Declaration Date		Apr. 25, 2013
Distribution Made To Member Or Limited Partner Subsequent Distribution Date		May 15, 2013
Distribution Made to Member or Limited Partner, Date of Record		May 07, 2013
Distribution Made to Member or Limited Partner, Distribution Date		Feb. 14, 2013
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit		$ 0.224
Distribution Made to Member or Limited Partner, Cash Distributions Paid		5,500,000
Managing Member or General Partner, Subsequent Distribution Amount		189,000
Members or Limited Partners, Subsequent Distribution Amount		4,620,000
Distributions Per Limited Partnership and General Partnership Unit, Outstanding, Basic	$ 0.375	$ 0.3850
Common [Member]
Distribution Made to Member or Limited Partner [Line Items]
Members or Limited Partners, Subsequent Distribution Amount		4,620,000
Subordinated Units [Member]
Distribution Made to Member or Limited Partner [Line Items]
Members or Limited Partners, Subsequent Distribution Amount		$ 4,620,000

X

- Definition

Annualized per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

+ References

No definition available.

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- Definition

The equity impact of cash distributions declared to a common shareholder or unit-holder by a LLC or LP.

+ References

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- Definition

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- Definition

Date of record for distribution of cash, stock, or units to a member or limited partner of limited liability company (LLC) or limited partnership (LP), in CCYY-MM-DD format.

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- Definition

Date of declaration for distribution of cash, stock, or units to a member or limited partner of limited liability company (LLC) or limited partnership (LP), in CCYY-MM-DD format.

+ References

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- Definition

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+ References

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- Definition

Cash dividends declared or paid to each outstanding limited partnership and general partnership unit during the reporting period.

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- Definition

Amount of cash or stock or unit payment to a limited liability corporation managing member or limited partnership general partner after the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-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 Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 2, 9

-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.

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Amount of cash or stock or unit payment to LLC member or LP limited partner after the end of an accounting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-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 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770

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