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Stock-based Compensation (Summary of Restricted Stock or Restricted Operating Partnership Units) (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Restricted Operating Partnership Units Plan  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested at beginning of period (shares) | shares 1,152,418
Granted (shares) | shares 816,019
Vested (shares) | shares (867,747)
Forfeited (in shares) | shares (17,603)
Unvested at end of period (shares) | shares 1,083,087
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested at beginning of period (in usd per share) | $ / shares $ 53.17
Granted (in usd per share) | $ / shares 32.10
Vested (in usd per share) | $ / shares 42.11
Expired or cancelled (in usd per share) | $ / shares 52.73
Unvested at end of period (in usd per share) | $ / shares $ 53.99
Restricted Stock Units RSU  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested at beginning of period (shares) | shares 25,315
Vested (shares) | shares (8,833)
Forfeited (in shares) | shares (708)
Unvested at end of period (shares) | shares 15,774
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested at beginning of period (in usd per share) | $ / shares $ 60.06
Vested (in usd per share) | $ / shares 64.17
Expired or cancelled (in usd per share) | $ / shares 58.56
Unvested at end of period (in usd per share) | $ / shares $ 57.82