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CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Unitholders
General Partner Interest
Accumulated Other Comprehensive Loss
Noncontrolling Interest
Balance at Dec. 31, 2012 $ 436,461 $ 456,538 $ (407) $ (19,670)  
Increase (Decrease) in Partners' Capital          
Net income (loss) 14,335 14,019 806   (490)
Acquisition of noncontrolling interest 40,000       40,000
Other comprehensive income 2,239     2,239  
Stock-based compensation 104 104      
Distributions to partners (16,346) (15,636) (710)    
Phantom unit dividends 68 68      
Balance at Mar. 31, 2013 $ 476,861 $ 455,093 $ (311) $ (17,431) $ 39,510