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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 12, 2018
Sep. 12, 2018
Mar. 07, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based long term incentive plan unit expense       $ 116 $ 93  
Capital shares reserved for future issuance (in shares)       1,874,223   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)       0 1,723  
Grants in Period (in shares)       37,709   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)       14,440   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