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Redeemable Noncontrolling Interest in Operating Partnership (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 6 Months Ended
May 11, 2021
Mar. 31, 2021
Jun. 30, 2021
Long Term Incentive Plan Units      
Noncontrolling Interest [Line Items]      
Vesting period (in years) 3 years 3 years 3 years
Units granted or issued (in shares) 202 244  
Fair value of units granted $ 1,400 $ 1,700  
Other than options (in shares)     2,400
Units which have not reached full economic parity with the common units (in shares)     572
Long Term Incentive Plan Units | Director      
Noncontrolling Interest [Line Items]      
Units granted or issued (in shares) 23    
Fair value of units granted $ 164    
Performance Long Term Incentive Plan Units      
Noncontrolling Interest [Line Items]      
Vesting period (in years) 3 years   3 years
Units granted or issued (in shares) 840    
Fair value of units granted $ 5,700    
Units which have not reached full economic parity with the common units (in shares)     900
Performance Shares      
Noncontrolling Interest [Line Items]      
Vesting period (in years) 3 years    
Units granted or issued (in shares) 446    
Fair value of units granted $ 6,000    
Performance Shares | 2021 Grants      
Noncontrolling Interest [Line Items]      
Vesting period (in years)     3 years
Minimum | Performance Long Term Incentive Plan Units | 2019 and 2020 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     0.00%
Minimum | Performance Shares | 2019 and 2020 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     0.00%
Minimum | Performance Shares | 2021 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     0.00%
Maximum | Performance Long Term Incentive Plan Units | 2019 and 2020 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     200.00%
Maximum | Performance Shares | 2019 and 2020 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     200.00%
Maximum | Performance Shares | 2021 Grants      
Noncontrolling Interest [Line Items]      
Award performance target (as a percent)     200.00%