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Unaudited Condensed Consolidated Statements Of Changes In Partners' Capital (USD $)
In Thousands
Total
General Partner
Common Unitholders
Preferred Unitholders
Total
Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2010 $ 239,760 $ 5,584 $ 262,918   $ 268,502 $ (28,742)
Distributions declared (distributions per unit $0.465) (Note 9) (18,005) (360) (17,645)   (18,005)  
Partnership net income 17,541 351 17,190   17,541  
Issuance of common units for vessel acquisition 57,055   57,055   57,055  
Issuance of units 1,470 1,470     1,470  
Equity compensation expense 1,159   1,159   1,159  
Other comprehensive income (note 8) 8,628         8,628
Balance at Jun. 30, 2011 307,608 7,045 320,677   327,722 (20,114)
Balance at Dec. 31, 2011 517,326 11,005 517,545 0 528,550 (11,224)
Distributions declared (distributions per unit $0.465) (Note 9) (32,916) (658) (32,258)   (32,916)  
Partnership net income 6,595 49 2,387 4,159 6,595  
Issuance of units 136,425     136,425 136,425  
Equity compensation expense 1,991   1,991   1,991  
Other comprehensive income (note 8) 9,840         9,840
Balance at Jun. 30, 2012 $ 639,261 $ 10,396 $ 489,665 $ 140,584 $ 640,645 $ (1,384)