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Restricted Stock, Performance Share and Cash Awards (Tables)
12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Schedule of Restricted Stock Awards Vesting Periods
The vesting periods of the 2019, 2018 and 2017 restricted stock unit awards are as follows (in actual shares):
 
Restricted Stock Units Granted
 
Vesting Period
 
2019
 
 
2018
 
 
2017
 
One year
   
14,800
     
18,900
     
21,600
 
Two years
   
12,000
     
12,700
     
12,750
 
Five years
   
387,900
     
407,500
     
442,000
 
                         
Total shares granted
   
414,700
     
439,100
     
476,350