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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted
The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the year ended December 31, 2018. There were no grants during the years ended December 31, 2019 and 2020.
202020192018
Dividend yieldN/AN/A2.85 %
Expected lifeN/AN/A3.5 years
Risk-free interest rateN/AN/A2.48 %
Expected stock price volatilityN/AN/A22.00 %
Summary of the status of stock options and changes during the period
A summary of the status of the Company's stock options as of December 31, 2020, 2019, and 2018 and changes during the years ended December 31, 2020, 2019, and 2018 are as follows:
202020192018
Options OutstandingWeighted Average
Exercise Price		Options OutstandingWeighted Average
Exercise Price		Options
Outstanding		Weighted
Average
Exercise
Price
Balance at beginning of year$1,007,665 $105.35 $1,104,780 $106.56 $1,504,809 $104.44 
Granted— — — — 5,830 100.77 
Exercised— — — — (307,334)92.85 
Lapsed or canceled(222,670)114.97 (97,115)119.19 (98,525)116.52 
Balance at end of year$784,995 $102.62 $1,007,665 $105.35 $1,104,780 $106.56 
Options exercisable at end of year784,022 $102.62 888,988 $104.66 760,834 $104.24 
Weighted average fair value of options granted during the year$—  $— $84,068  
Schedule of other share-based compensation, activity
A summary of the Company's restricted stock as of December 31, 2020, 2019, and 2018 and charges during the years ended December 31, 2020, 2019, and 2018 are as follows:
202020192018
Balance at beginning of year3,465,347 3,354,142 3,204,703 
Granted8,959 122,768 158,281 
Canceled(34,632)(11,563)(8,842)
Balance at end of year3,439,674 3,465,347 3,354,142 
Vested during the year128,891 110,048 89,502 
Compensation expense recorded$10,895,459 $12,892,249 $12,757,704 
Total fair value of restricted stock granted during the year$734,315 $11,131,181 $13,440,503