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Equity Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 and 2016.
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Adjustments to additional paid-in capital and common stock for: |  |  |  |  |  |  |
Compensation costs charged to income: |  |  |  |  |  |  |
ESPP | $ | — |  |  | — |  |  | $ | 100 |  |  | 79 |
Restricted stock and deferred restricted stock | 458 |  |  | 379 |  |  | 944 |  |  | 773 |
Total compensation costs charged to income | $ | 458 |  |  | 379 |  |  | $ | 1,044 |  |  | 852 |
Excess tax benefits realized from stock issuance: |  |  |  |  |  |  |
Restricted stock and deferred restricted stock | $ | — |  |  | 94 |  |  | $ | — |  |  | 202 |
Total excess tax benefits realized from stock issuance | $ | — |  |  | 94 |  |  | $ | — |  |  | 202 |
Proceeds from ESPP and similar instruments: |  |  |  |  |  |  |
ESPP | $ | — |  |  | — |  |  | $ | 570 |  |  | 451 |
Total proceeds from the ESPP and similar instruments | $ | — |  |  | — |  |  | $ | 570 |  |  | 451 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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