Partners' Capital and Distributions Change in common and Class F units (Details)	3 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Class F Units [Member]	Dec. 31, 2012 Class F Units [Member]	Jun. 30, 2013 Common Units [Member]	Dec. 31, 2012 Common Units [Member]
Capital Unit [Line Items]
Limited Partners' Capital Account, Units Outstanding					6,274,483	0	207,233,212	170,951,457
Issuance Of Common Units Under Ltip Net Of Forfeitures And Tax Withholdings					0		21,796
Issuance Of Common Units Under Equity Distribution Program,net of costs					0		4,887,540
Issuance of common units and Class F units in connection with SUGS Acquisition	6,274,483	0	6,274,483	0			31,372,419