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Long-Term Incentive Plan Units (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 12, 2018
Sep. 12, 2018
Mar. 07, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common Stock, Capital Shares Reserved for Future Issuance       1,874,223  
Share-based long term incentive plan unit expense       $ 415 $ 385
Long-Term Incentive Plan Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
LTIP Unit Grants in Period       33,546 24,421
Director [Member] | Long-Term Incentive Plan Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
LTIP Unit Grants in Period   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 17,383   1,723    
Non-controlling interest in Operating Partnership [Member] | Noncontrolling Interest [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Operating Partnership LTIP Units Redeemed       503,988