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Certain provisions of the partnership agreement (Details Textuals 3) (USD $)	6 Months Ended
	Jun. 30, 2012
Partners' Capital Notes [Abstract]
LP units issuance date	May 15, 2012
Partners' Capital Account, Units, Sale of Units	10,200,000
Limited Partners Unit Price Per Unit	$ 16.28
Proceeds from Issuance of Common Limited Partners Units	$ 158,014,000
Minority Interest Decrease From Stock Issuance	12,300,000
Deferred Tax Liabilities Investments Decrease	$ 5,100,000

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

The cash inflow from the issuance of common limited partners units during the period.