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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Restricted Units      
Outstanding, beginning balance (in shares) 124,662    
Restricted units granted (in shares) 84,987 92,019 44,490
Restricted units vested (in shares) (45,633)    
Outstanding, ending balance (in shares) 164,016 124,662  
Weighted Average Grant Date Fair Value per unit      
Outstanding, beginning balance (in dollars per share) $ 17.60    
Restricted units granted (in dollars per share) 14.11 $ 13.16 $ 23.22
Restricted units vested (in dollars per share) 18.10    
Outstanding, ending balance (in dollars per share) $ 15.65 $ 17.60  
Vested in period, fair value $ 749 $ 1,924 $ 1,516