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Share-Based Compensation - Restricted Unit Activity (Details) - Time-Based Restricted Stock Units - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Restricted Units      
Outstanding, beginning balance (in shares) 164,016    
Restricted units granted (in shares) 431,913 84,987 92,019
Restricted units vested (in shares) (104,733)    
Outstanding, ending balance (in shares) 491,196 164,016  
Weighted Average Grant Date Fair Value per unit      
Outstanding, beginning balance (in dollars per share) $ 15.65    
Restricted units granted (in dollars per share) 13.10 $ 14.11 $ 13.16
Restricted units vested (in dollars per share) 16.07    
Outstanding, ending balance (in dollars per share) $ 13.32 $ 15.65  
Vested in period, fair value $ 1,784 $ 749 $ 1,924