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Partners' Capital (Schedule Of Cash Distribution Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Feb. 08, 2013
Partners' Cash Distribution Activity [Line Items]                        
Cash distribution payment date Feb. 11, 2011 Feb. 15, 2013 Nov. 09, 2012 Aug. 10, 2012 May 11, 2012 Feb. 10, 2012 Nov. 11, 2011 Aug. 12, 2011 May 13, 2011      
Distribution to partners                   $ 37,270 $ 25,507  
Cash distribution per unit                       $ 0.4875
Other Unitholders [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners 1,607 28,784 22,033 22,088 21,306 17,121 14,803 14,807 14,809      
Cash distribution per unit 0.0448 0.4875 0.4875 0.4875 0.4750 0.4750 0.4125 0.4125 0.4125 $ 0.4875 $ 0.4750  
Class C Convertible Preferred [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners   3,500 3,500 3,500 3,500 3,424            
Cash distribution per unit   0.21 [1] 0.21 [1] 0.21 [1] 0.21 [1] 0.21 [1]       $ 0.21 [1] $ 0.21 [1]  
General Partner [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners 2 25 20 20 20 16 15 15 15      
Limited Partners-Public Common [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners 779 25,275 18,529 18,584 17,892 8,344 7,180 7,184 7,186      
Limited Partners-Affiliated - Common [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners 506 3,484       5,368 4,660 4,660 4,660      
Limited Partners-Affiliated - Subordinated [Member]
                        
Partners' Cash Distribution Activity [Line Items]                        
Distribution to partners 320   3,484 3,484 3,394 3,393 2,948 2,948 2,948      
[1] Preferred Units were prorated a quarterly distribution for the portion of the fourth quarter beginning on October 3, 2011 through December 31, 2011 in accordance with the Partnership Agreement