Equity Plans (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2018, and 2017.

	Three months ended June 30,			Six months ended June 30,
	2018		2017	2018		2017
Adjustments to additional paid-in capital and common stock for:
Compensation costs charged to income:
ESPP	$	—	—	$	115	100
Restricted stock and deferred restricted stock	392		458	764		944
Total compensation costs charged to income	$	392	458	$	879	1,044
Proceeds from ESPP	$	—	—	$	653	570