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Unit Based Awards - Long-Term Incentive Plans - Summary of restricted unit activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
shares
Restricted unit awards  
Number of Units  
Non-vested, beginning of period, numbers of units (in shares) | shares 114,876
Vested, number of units (in shares) | shares (38,514)
Non-vested, end of period, number of units (in shares) | shares 124,362
Weighted Average Grant-Date Fair Value Per Unit  
Non-vested, beginning of period, weighted average grant-date fair value per unit (in dollars per share) | $ / shares $ 3.65
Vested, weighted average grant-date fair value per unit (in dollars per share) | $ / shares 4.76
Non-vested, end of period, weighted average grant-date fair value per unit (in dollars per share) | $ / shares $ 3.36
Aggregate intrinsic value, end of year | $ $ 373
Time Based Restricted Units  
Number of Units  
Granted, number of units (in shares) | shares 48,000
Weighted Average Grant-Date Fair Value Per Unit  
Granted, weighted average grant-date fair value per unit (in dollars per share) | $ / shares $ 3.79