Partners' Capital (Schedule Of Cash Distribution Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Partners' Cash Distribution Activity [Line Items]
Cash distribution payment date		May 15, 2013		Feb. 15, 2013
Distribution to partners			$ 70,752
Other Unitholders [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners		31,979		28,784
Cash distribution per unit		$ 0.4875		$ 0.4875
Class C Convertible Preferred [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners		3,500	7,000	3,500
Cash distribution per unit		$ 0.21		$ 0.21
General Partner [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners		25	50	25
Class B Units [Member]
Partners' Cash Distribution Activity [Line Items]
Cash distribution payment date				May 15, 2013
Distribution to partners	2,990	2,990	5,980	2,990
Class B Units [Member] | Other Unitholders [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners				2,990
Cash distribution per unit				$ 0.4875
Limited Partners-Public Common [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners		25,480	50,755	25,275
Limited Partners-Affiliated - Common [Member]
Partners' Cash Distribution Activity [Line Items]
Distribution to partners		$ 3,484	$ 6,967	$ 3,484