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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 15, 2023
Sep. 14, 2021
Mar. 07, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Capital shares reserved for future issuance (in shares)       1,509,481 1,626,401  
Share-based long term incentive plan unit expense       $ 1.4 $ 1.0 $ 0.7
Long-Term Incentive Plan Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       (4,066) (5,710) (3,638)
Grants in Period (in shares)       113,615    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       97,826 68,985 70,460
Director [Member] | Long-Term Incentive Plan Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in Period (in shares)       24,796    
Manager [Member] | Long-Term Incentive Plan Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0 0 0
Non Manager [Member] | Long-Term Incentive Plan Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       (4,066) (5,710) (3,638)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 32,776 24,796 40,254 97,826 68,985 70,460