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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of Share Incentive Plans
A summary of activity under our share incentive plans for the six months ended June 30, 2021 is shown below:
Nonvested
Share
Awards
Outstanding
Weighted
Average
Exercise /  Grant Price
Nonvested share awards outstanding at December 31, 2020239,728 $103.48 
Granted184,499 105.17 
Vested(191,723)101.34 
Forfeited(8,558)106.52 
Total nonvested share awards outstanding at June 30, 2021223,946 $106.59