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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 11, 2019
Dec. 12, 2018
Sep. 12, 2018
Mar. 07, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based long term incentive plan unit expense         $ 100 $ 103 $ 346 $ 296  
Capital shares reserved for future issuance (in shares)         1,859,671   1,859,671   1,874,223
Long-Term Incentive Plan Units [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
LTIP Unit Grants in Period (in units)         14,552 14,440 14,552 16,163  
Grants in Period (in shares)             37,821   39,432
Non Manager [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) 14,552       14,552 14,440 14,552 16,163  
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)             14,552   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)   17,383   1,723          
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   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
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