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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, 2012 $ 573,828 $ 9,049 $ 425,497 $ 139,744 $ 574,290 $ (462)
Distributions declared and paid (distributions per common and preferred unit) (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 preferred units (Note 9) 72,535     72,535 72,535  
Equity compensation expense 2,739   2,739   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
Balance at Dec. 31, 2013 781,426 9,250 559,155 213,021 781,426 0
Distributions declared and paid (distributions per common and preferred unit) (Note 9) (50,036) (821) (41,136) (8,079) (50,036)  
Partnership's net income 19,058 216 10,838 8,004 19,058  
Balance at Jun. 30, 2014 $ 750,448 $ 8,645 $ 528,857 $ 212,946 $ 750,448 $ 0