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Redeemable Noncontrolling Interest in Operating Partnership (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 15, 2020
Sep. 28, 2020
May 22, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 06, 2020
Mar. 16, 2020
Director | COVID-19                
Noncontrolling Interest [Line Items]                
Temporary reduction to cash retainer               25.00%
Percentage of cash retainer paid in equity             25.00%  
Percentage of cash retainer paid in cash             75.00%  
Long Term Incentive Plan Units                
Noncontrolling Interest [Line Items]                
Vesting period       3 years        
Other than options (in shares)       1,100        
Units which have not reached full economic parity with the common units (in shares)       104        
Unamortized cost       $ 771        
Unamortized cost, period of recognition       2 years 2 months 12 days        
Weighted average period for recognition       1 year 4 months 24 days        
Long Term Incentive Plan Units | Director                
Noncontrolling Interest [Line Items]                
Number of units (in shares) 4 8 17          
Fair value of units $ 19 $ 20 $ 44          
Performance Long Term Incentive Plan Units                
Noncontrolling Interest [Line Items]                
Other than options (in shares)       220        
Shares forfeited (in shares)       211 281 312    
Units which have not reached full economic parity with the common units (in shares)       60        
Unamortized cost       $ 409        
Unamortized cost, period of recognition       2 years        
Weighted average period for recognition       1 year 8 months 12 days        
Minimum | Performance Long Term Incentive Plan Units                
Noncontrolling Interest [Line Items]                
Award performance target       0.00%        
Maximum | Performance Long Term Incentive Plan Units                
Noncontrolling Interest [Line Items]                
Award performance target       200.00%