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Equity Plans (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 30, 2018 $ / shares shares | Jan. 02, 2018 vesting_installment $ / shares shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ |  |  | $ 487 | $ 586
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 |  | $ 60.22 |  |
Restricted stock and deferred restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ |  |  | $ 372 | 486
Recognition period for unrecognized compensation cost |  |  | 1 year 6 months |
Unrecognized compensation costs | $ |  |  | $ 2,394 |
Key officers | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (shares) | shares |  | 12,296 |  |
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 | 4,081 |  |  |
Key officers | Performance Shares | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target vesting percentage | 0.00% |  |  |
Key officers | Performance Shares | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares | $ 58.02 |  |  |
Target vesting percentage | 150.00% |  |  |
Key officers | Performance Shares 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (shares) | shares | 5,259 |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares | $ 55.89 |  |  |
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% |  |  |
Key officers | Performance Shares 3 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of equity instruments granted (shares) | shares | 6,342 |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares | $ 63.85 |  |  |
Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining shares available for issuance under the Incentive Plan (shares) | shares |  |  | 890,179 |
Shares issuable upon exercise of Incentive Plan awards (shares) | shares |  |  | 191,547 |
Employee Stock Purchase Plan (ESPP) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs charged to income: | $ |  |  | $ 115 | 100
Proceeds from ESPP | $ |  |  | $ 653 | 570
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% |
Plan expense | $ |  |  | $ 53 | $ 63
Unrecognized compensation costs | $ |  |  | $ 107 |
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 |

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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 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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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