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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 10, 2020
Mar. 04, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based long term incentive plan unit expense     $ 0.2 $ 0.1 $ 0.5 $ 0.3    
Capital shares reserved for future issuance (in shares)     1,794,021   1,794,021   1,832,309  
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     3,638 3,610 3,638 3,610    
Grants in Period (in shares)         69,227      
Director [Member] | Long-Term Incentive Plan Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grants in Period (in shares)         22,840      
Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
LTIP Unit Grants in Period (in units) 22,840 14,811            
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 0    
Vest December 13, 2020 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grants in Period (in shares)         12,818      
Vest December 11, 2020 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grants in Period (in shares)         8,691      
Vest December 13, 2021 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grants in Period (in shares)         10,067      
Non-controlling interest in Operating Partnership [Member] | Non-controlling Interest                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Operating Partnership LTIP Units Redeemed (in units)               503,988