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Condensed Consolidated Statements of Changes in Partners' Capital - 3 months ended Mar. 31, 2018 - USD ($)
$ in Thousands
Common units
Limited partner
General partner
Total
Limited Partners' Capital Account at Dec. 31, 2017 $ 626,922    
General Partners' Capital Account at Dec. 31, 2017   $ 6,931  
Partners' capital at Dec. 31, 2017     $ 633,853
Partners' capital units outstanding (in shares) at Dec. 31, 2017 62,194,405    
Increase (Decrease) in Partners' Capital      
Vesting of phantom units $ 4,064   4,064
Vesting of phantom units (in units) 240,000    
Distributions and distribution equivalent rights $ (32,658) (754) (33,412)
Issuance of common units under the DRIP $ 170   170
Issuance of common units under the DRIP (in shares) 10,000    
Unit-based compensation of equity classified awards $ 28   28
Net (loss) (14,597) (773) (15,370)
General Partners' Capital Account at Mar. 31, 2018   $ 5,404  
Limited Partners' Capital Account at Mar. 31, 2018 $ 583,929    
Partners' capital at Mar. 31, 2018     $ 589,333
Partners' capital units outstanding (in shares) at Mar. 31, 2018 62,443,593