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CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($)
$ in Thousands
Total
Accumulated other comprehensive income (loss)
Class A Units
Limited Partner
Common Units
Limited Partner
Class A Units
Limited Partner
Subordinated Units
General Partner
Partners' capital account beginning balance (in units) at Dec. 31, 2016     138,750 14,185,599 138,750 8,370,836 461,136
Partners' capital account beginning balance at Dec. 31, 2016 $ 58,526 $ (1,726)   $ 128,903 $ 1,929 $ (70,936) $ 356
Increase (Decrease) in Partners' Capital [Roll Forward]              
Conversion of units (in units)       2,162,084 46,250 2,092,709  
Conversion of units       $ (19,047) $ (606) $ 19,653  
Common units issued for vested phantom units (in units)       190,016      
Common units issued for vested phantom units       $ (1,072)      
Issuance of common units (in shares)       3,000,000      
Issuance of common units       $ 33,700      
Net income 13,704     9,510 59 3,821 314
Unit based compensation expense       1,694 232    
Forfeited units (in shares)     0        
Distributions       $ (10,661) $ (80) $ (5,066) $ (335)
Cumulative translation adjustment 1,916 1,916          
Partners' capital account ending balance (in units) at Jun. 30, 2017     92,500 19,537,699 92,500 6,278,127 461,136
Partners' capital account ending balance at Jun. 30, 2017 92,558 190   $ 143,027 $ 1,534 $ (52,528) $ 335
Partners' capital account beginning balance (in units) at Dec. 31, 2017     82,500 19,537,971 82,500 6,278,127 461,136
Partners' capital account beginning balance at Dec. 31, 2017 84,890 1,834   $ 136,645 $ 1,468 $ (55,237) $ 180
Increase (Decrease) in Partners' Capital [Roll Forward]              
Conversion of units (in units)       2,131,459 38,750 2,092,709  
Conversion of units       $ (18,245) $ (674) $ 18,919  
Common units issued for vested phantom units (in units)       244,794      
Common units issued for vested phantom units       $ (1,346)      
Net income 13,312     10,543 24 2,330 415
Unit based compensation expense       2,440 $ 101 26 1
Forfeited units (in shares)     (5,000)   (5,000)    
Forfeited units         $ 73    
Distributions       $ (15,215) $ (42) $ (3,835) $ (501)
Cumulative translation adjustment (2,788) (2,788)          
Partners' capital account ending balance (in units) at Jun. 30, 2018     38,750 21,914,224 38,750 4,185,418 461,136
Partners' capital account ending balance at Jun. 30, 2018 $ 77,116 $ (954)   $ 114,822 $ 950 $ (37,797) $ 95