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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Compensation [Abstract]  
Summary of Share Incentive Plans
A summary of activity under our share incentive plans for the six months ended June 30, 2019 is shown below:
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Exercise /  Grant Price
Nonvested share awards outstanding at December 31, 2018
390,681

 
$
79.82

Granted
197,372

 
98.71

Vested
(254,854
)
 
81.40

Forfeited
(11,002
)
 
84.29

Total nonvested share awards outstanding at June 30, 2019
322,197

 
$
89.99