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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, 2011 $ 517,326 $ 11,005 $ 517,545 $ 0 $ 528,550 $ (11,224)
Distributions declared (distributions per unit of $0.465 in 2012 and distributions per common unit of $0.465 and preferred unit of $0.4275 in 2013) (Note 9) (32,916) (658) (32,258) 0 (32,916)  
Partnership's net income 6,595 49 2,387 4,159 6,595  
Issuance of units (Note 9) 136,425     136,425 136,425  
Equity compensation expense 1,991 0 1,991 0 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)
Balance at Dec. 31, 2012 573,828 9,049 425,497 139,744 574,290 (462)
Distributions declared (distributions per unit of $0.465 in 2012 and distributions per common unit of $0.465 and preferred unit of $0.4275 in 2013) (Note 9) (41,511) (658) (32,258) (8,595) (41,511)  
Partnership's net income 64,332 1,076 52,716 10,540 64,332  
Issuance of units (Note 9) 72,535     72,535 72,535  
Equity compensation expense 2,739 0 2,739 0 2,739  
Other comprehensive income (Note 8) 462         462
Balance at Jun. 30, 2013 $ 672,385 $ 9,467 $ 448,694 $ 214,224 $ 672,385 $ 0