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Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Other Employee Benefit Plans [Abstract]  
Schedule of shares purchased in the open market for employees

Shares purchased in the open market for employees for the years ended December 31, 2015, 2016, and 2017 were as follows:

 

 

 

 

 

 

 

 

 

    

Shares

    

Average price

 

 

 

purchased

 

per share

 

2015

 

5,136

 

$

49.10

 

2016

 

4,988

 

$

46.46

 

2017

 

4,718

 

$

77.05