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Stock Incentive Plans and Stock Purchase Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Restricted Stock and Deferred Stock Awards
The activity related to the Company’s restricted stock and deferred stock awards and the corresponding weighted average grant-date fair values for the year ended December 31, 2020 are as follows:​​​​​​​
 
 
 
 
 
 
 
 
 
 
  
Number of

Shares
 
  
Weighted
Average Fair
Value
 
Non-vested shares at January 1, 2020
  
 
1,723,115
 
  
$
40.77
 
Awarded
  
 
1,361,712
 
  
$
23.54
 
Forfeited
  
 
(173,455
) 
  
$
31.68
 
Vested
  
 
(1,700,255
) 
  
$
34.88
 
 
  
 
 
 
  
 
 
 
Non-vested shares at December 31, 2020
  
 
1,211,117
 
  
$
30.97
 
 
  
 
 
 
  
 
 
 
Schedule of Activity and Certain Other Information Related to Stock Option Awards
The activity and certain other information related to the Company’s outstanding stock option awards for the year ended December 31, 2020 are as follows:
 
    
Number of

Stock Options
     
Weighted

Average

Exercise

Price
     
Weighted
Average
Remaining
Contractual
Term

(in years)
     
Aggregate
Intrinsic

Value

(in millions)
  
Outstanding at January 1, 2020
      72,808      $ 32.49                    
Awarded
      982,731     
$
 16.99                    
Expired
      (56,248 )    
$
 31.39                 —  
                               
 
 
  
Outstanding at December 31, 2020
      999,291      $ 17.30        2.58      $ 7.4  
    
 
 
              
 
 
     
 
 
  
Exercisable at December 31, 2020
      16,560      $ 36.25        0.34        —