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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 17, 2018
shares
Jun. 28, 2017
USD ($)
$ / shares
shares
Mar. 11, 2015
$ / shares
shares
Mar. 02, 2015
$ / shares
employee
shares
Mar. 17, 2015
$ / shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
$ / shares
shares
Jun. 15, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share awards granted               21,917 23,191 96,286    
Vested in period               50,328 30,879 234    
Unrecognized compensation cost | $               $ 527        
Unrecognized compensation cost recognition period               2 years 7 months 6 days        
Common units redemption to common stock               0.01923        
Stock-based compensation | $               $ 1,026 $ 974 $ 1,237    
2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of additional shares authorized 300,000                      
Shares available for issuance               511,518        
Shares issued to independent directors               15,240 11,503 5,369    
Maximum [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares authorized                       761,538
Employees and Officers [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period               5 years        
Members of the Board of Directors [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period               3 years        
Stock Options [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vested options, outstanding                     865  
Vested options, weighted average exercise price | $ / shares                     $ 48.945  
Market Based Share Awards [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unrecognized compensation cost | $   $ 1,380                    
Market Based Share Awards [Member] | Executive Officer [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares authorized   36,692                    
Market price target | $ / shares               $ 11.00        
Market price target increments | $ / shares   $ 1                    
Award vesting date               Nov. 22, 2019        
Trading period used to determine award price   60 days                    
Market Based Share Awards [Member] | Executive Officer [Member] | Minimum [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Market price target | $ / shares   $ 11.00                    
Market Based Share Awards [Member] | Executive Officer [Member] | Maximum [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Market price target | $ / shares   $ 18.00                    
Performance Based Share Awards [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unrecognized compensation cost | $               $ 147 $ 169 $ 191    
Additional shares earned per percentage if actual FFO exceeds budgeted FFO   391                    
Percentage increment required to earn additional shares   2.00%                    
Grant date fair value, assumed percentage of budgeted FFO               100.00%        
Performance Based Share Awards [Member] | Minimum [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Required percentage of budgeted FFO to achieve performance award   85.00%                    
Potential shares earned and issued if operating results are obtained   11,741                    
Performance Based Share Awards [Member] | Maximum [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Required percentage of budgeted FFO to achieve performance award   101.00%                    
Potential shares earned and issued if operating results are obtained   19,569                    
Additional shares earned per percentage if actual FFO exceeds budgeted FFO   3,910                    
Performance Based Share Awards [Member] | Executive Officer [Member] | 2016 Stock Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share awards granted           13,778 21,133          
Grant date fair value | $           $ 122 $ 212          
Vested in period           2,550            
Vested in period, fair value | $           $ 22            
Warrants [Member] | Executive Officer [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration date               Mar. 02, 2018        
Number of officers granted share awards | employee       1                
Number of shares called by warrant       101,213                
Common stock warrants, exercise price | $ / shares     $ 9.88 $ 9.88 $ 12.48              
Expiration period       3 years                
Shares purchased with warrants     35,060                  
Warrants [Member] | Executive Officer [Member] | Minimum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Units earned, increments         33.33%              
Warrants [Member] | Executive Officer [Member] | Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Units earned, increments         50.00%              
LTIP Common Units [Member] | Executive Officer [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration date               Jun. 28, 2017        
Share awards granted       5,263,152                
Number of officers granted share awards | employee       1                
Units earned, increments       33.33%                
Award vesting date               Mar. 31, 2018        
Common units redemption to common stock       0.01923                
LTIP Common Units [Member] | Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock price per share milestone | $ / shares       $ 22.75                
LTIP Common Units [Member] | Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock price per share milestone | $ / shares       29.25                
LTIP Common Units [Member] | Executive Officer [Member] | Share-based Compensation Award, Tranche Three [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock price per share milestone | $ / shares       $ 35.75                
LTIP Common Units [Member] | Executive Officer [Member] | Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Redemption, number of shares       101,213