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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

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