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Equity Plans (Tables)
9 Months Ended
Sep. 30, 2018
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 stock options and similar instruments, and the tax benefit realized from stock options and similar instruments exercised, that were recorded to additional paid-in capital and common stock, by award type, are presented below for the three and nine months ended September 30, 2018, and 2017.
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Adjustments to additional paid-in capital and common stock for:
 
 
 
 
 
 
 
Compensation costs charged to income:
 
 
 
 
 
 
 
   ESPP
$
127

 
114

 
$
242

 
214

   Restricted stock and deferred restricted stock
377

 
475

 
1,141

 
1,419

Total compensation costs charged to income
$
504

 
589

 
$
1,383

 
1,633

Proceeds from ESPP
$
718

 
645

 
$
1,371

 
1,215