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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Share and Restricted Stock Unit Activity
The following table presents the changes in Equity Commonwealth’s issued and outstanding common shares and units for the year ended December 31, 2019:
Common SharesOP Units and LTIP UnitsTotal
Outstanding at January 1, 2019
121,572,155  45,720  121,617,875  
Repurchase of shares
(168,327) —  (168,327) 
Restricted share grants, time-based LTIP Unit grants and vested restricted stock units, net of forfeitures
520,371  2,940  523,311  
Outstanding at December 31, 2019
121,924,199  48,660  121,972,859  
Noncontrolling ownership interest in the Operating Trust0.04 %
The table below presents a summary of restricted share, RSU and LTIP Unit activity for the years ended December 31, 2019, 2018 and 2017:
 Number
of
Restricted Shares and Time-Based LTIP Units		Weighted
Average
Grant Date
Fair Value		Number
of
RSUs and Market-Based LTIP Units		Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2016
752,209  $26.79  2,572,768  $15.75  
Granted144,192  31.51  585,967  15.97  
Vested(217,449) 27.97  (226,258) 15.99  
Not earned(1)
—  —  (800,530) 15.99  
Outstanding at December 31, 2017
678,952  $27.41  2,131,947  $15.69  
Granted154,209  30.05  634,628  14.90  
Vested(407,273) 27.06  (367,260) 15.79  
Not earned(1)
—  —  (352,671) 15.47  
Outstanding at December 31, 2018
425,888  $28.70  2,046,644  $15.47  
Granted138,819  32.20  568,609  15.91  
Vested(164,074) 28.60  (384,811) 15.53  
Not earned(1)
—  —  (225,654) 15.57  
Forfeited(319) 31.08  (1,613) 15.56  
Outstanding at December 31, 2019
400,314  $29.95  2,003,175  $15.57  
(1) The table presents the maximum number of shares issued or issuable from outstanding equity awards. RSUs and market-based LTIP Units not earned are the shares market-based award recipients do not receive based on the performance measurement completed at the end of the performance period.
Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period
The assumptions and fair values for the RSUs and market-based LTIP Units granted for the years ended December 31, 2019, 2018 and 2017 are included in the following table on a per share and unit basis.
 201920182017
Fair value of RSUs and market-based LTIP Units granted at the target amount$39.65  $37.13  $39.81  
Fair value of RSUs and market-based LTIP Units granted at the maximum amount$15.91  $14.90  $15.97  
Expected term (years)444
Expected volatility13.98 %15.74 %17.30 %
Expected dividend yield— %1.68 %1.59 %
Risk-free rate2.52 %2.26 %1.49 %