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Equity Plans (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Costs Charged to Income and Proceeds from the Exercise of Any Restricted Stock and Similar Instruments that are Recorded to Additional Paid-In Capital and Common Stock, by Award Type
A summary of compensation costs charged to income and proceeds from the exercise of any restricted stock and similar instruments 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, 2021, and 2020.
 Three months ended June 30,Six months ended June 30,
 2021202020212020
Adjustments to additional paid-in capital and common stock for:
Compensation costs charged to income:
   ESPP$— — $181 171 
   Restricted stock and deferred restricted stock791 1,009 1,890 1,089 
Total compensation costs charged to income$791 1,009 $2,071 1,260 
ESPP proceeds$— — $1,026 970