Public Offering of units and Certain Provisions of the Partnership Agreementl (Partnership Agreement Amended) (Details Textuals) (Preferred Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Preferred Stock [Member]
Preferred Units [Line Items]
Partnership Amendment Date	Sep. 13, 2012
Payment In Kind Date	Dec. 31, 2013
Pre Amendment Pik Fixed Price	$ 8.50
Post Amendment Pik Fixed Price	$ 13.25
Optional Redemption Date 1	Dec. 31, 2013
Optional Redemption Date 2	Feb. 10, 2014
Mandatory Redemption Date 1	Jan. 19, 2013
Mandatory Redemption Date 2	Dec. 13, 2013