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Equity Plans (Tables)
6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan A summary of compensation costs charged to income, proceeds from the exercise of any stock options and similar instruments and the tax benefit realized from any stock options and similar instruments exercised, that are recorded to additional paid-in capital and common stock, by award type, are presented below for the three and six months ended June 30, 2019, and 2018.
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Adjustments to additional paid-in capital and common stock for:
 
 
 
 
 
 
 
Compensation costs charged to income:
 
 
 
 
 
 
 
   ESPP
$

 

 
$
143

 
115

   Restricted stock and deferred restricted stock
718

 
392

 
1,461

 
764

Total compensation costs charged to income
$
718

 
392

 
$
1,604

 
879

ESPP proceeds
$

 

 
$
811

 
653