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Equity Plans (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 26, 2017 $ / shares shares | Jan. 24, 2017 $ / shares shares | Jan. 03, 2017 vesting_installment $ / shares shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation costs charged to income: |  |  |  | $ 458 | $ 379 | $ 1,044 | $ 852
Excess tax benefits realized from stock issuance: |  |  |  | 0 | 94 | 0 | 202
Proceeds from ESPP and similar instruments: |  |  |  | 0 | 0 | 570 | 451
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  |  | $ 52.59 |  |  |  |
Restricted stock and deferred restricted stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation costs charged to income: |  |  |  | 458 | 379 | 944 | 773
Excess tax benefits realized from stock issuance: |  |  |  | 0 | 94 | $ 0 | 202
Recognition period for unrecognized compensation cost |  |  |  |  |  | 10 months 17 days |
Unrecognized compensation costs |  |  |  | $ 1,658 |  | $ 1,658 |
Key officers | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity instruments granted (shares) | shares |  |  | 8,564 |  |  |  |
Number of equal successive installments for vesting of stock awards (vesting installments) | vesting_installment |  |  | 3 |  |  |  |
Key officers | Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity instruments granted (shares) | shares |  | 6,639 |  |  |  |  |
Key officers | Performance Shares | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity instruments granted (shares) | shares |  | 10,744 |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 50.24 |  |  |  |  |
Target vesting percentage |  | 100.00% |  |  |  |  |
Key officers | Performance Shares 2 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity instruments granted (shares) | shares |  | 2,737 |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 48.56 |  |  |  |  |
Key officers | Performance Shares 2 | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target vesting percentage |  | 0.00% |  |  |  |  |
Key officers | Performance Shares 2 | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target vesting percentage |  | 150.00% |  |  |  |  |
Director [Member] | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity instruments granted (shares) | shares | 9,240 |  |  |  |  |  |
Director [Member] | Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares | $ 51.13 |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining shares available for issuance under the Incentive Plan (shares) | shares |  |  |  | 957,121 |  | 957,121 |
Shares issuable upon exercise of Incentive Plan awards (shares) | shares |  |  |  |  |  | 214,333 |
Employee Stock Purchase Plan (ESPP) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation costs charged to income: |  |  |  | $ 0 | 0 | $ 100 | 79
Proceeds from ESPP and similar instruments: |  |  |  | $ 0 | 0 | $ 570 | 451
Purchase price of common stock under ESPP (percent) |  |  |  |  |  | 85.00% |
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent) |  |  |  | 10.00% |  | 10.00% |
Plan expense |  |  |  | $ 54 | $ 47 | $ 117 | $ 87
Unrecognized compensation costs |  |  |  | $ 20 |  | $ 20 |
Employee Stock Purchase Plan (ESPP) | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for issuance under the plan (shares) | shares |  |  |  | 400,000 |  | 400,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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