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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 17, 2020
Sep. 10, 2020
Mar. 04, 2020
Dec. 12, 2018
Sep. 12, 2018
Mar. 07, 2018
Dec. 31, 2020
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             $ 722 $ 475 $ 415
Capital shares reserved for future issuance (in shares)             1,761,212 1,832,309 1,874,223
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 13,092 3,334
Grants in Period (in shares)             75,550   39,432
Director [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)         14,440        
Grants in Period (in shares)             22,840   14,440
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) 32,809 22,840 14,811 17,383   1,723      
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 9,482 0
Vest December 11, 2019 [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)               8,692 8,692
Vest December 12, 2019 [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)                 5,886
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 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