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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of Share Incentive Plans
A summary of activity under our share incentive plans for the three months ended March 31, 2021 is shown below:
Nonvested
Share
Awards
Outstanding
Weighted
Average
Exercise /  Grant Price
Nonvested share awards outstanding at December 31, 2020239,728 $103.48 
Granted170,321 103.77 
Vested(176,346)100.16 
Forfeited(6,924)106.70 
Total nonvested share awards outstanding at March 31, 2021226,779 $106.18