Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2011
Income Taxes
Percentage of taxable income distributed to the partnership					100.00%
Provision for federal income taxes	$ 0	$ 0	$ 0	$ 0

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