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Redeemable Noncontrolling Interest in Operating Partnership (Narrative) (Details)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2021
shares
Long Term Incentive Plan Units    
Noncontrolling Interest [Line Items]    
Vesting period (in years) 3 years 3 years
Units granted (in shares) 244  
Fair value of units granted | $ $ 1.7  
Other than options (in shares) 1,300 1,300
Units which have not reached full economic parity with the common units (in shares) 344 344
Performance Long Term Incentive Plan Units    
Noncontrolling Interest [Line Items]    
Vesting period (in years)   3 years
Other than options (in shares) 220 220
Units which have not reached full economic parity with the common units (in shares) 60 60
Minimum | Performance Long Term Incentive Plan Units    
Noncontrolling Interest [Line Items]    
Award performance target (as a percent)   0.00%
Maximum | Performance Long Term Incentive Plan Units    
Noncontrolling Interest [Line Items]    
Award performance target (as a percent)   200.00%