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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 04, 2020
Mar. 31, 2020
Mar. 31, 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    
Capital shares reserved for future issuance (in shares)   1,816,861   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   0 0    
Grants in Period (in shares)   60,939      
Director [Member] | Long-Term Incentive Plan Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in Period (in shares)   14,552      
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) 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    
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