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Equity Plans (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 25, 2018 $ / shares | Jan. 30, 2018 $ / shares shares | Jan. 02, 2018 vesting_installment $ / shares shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation costs charged to income: | $ |  |  |  | $ 504 | $ 589 | $ 1,383 | $ 1,633
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: | $ |  |  |  | 377 | 475 | $ 1,141 | 1,419
Recognition period for unrecognized compensation cost |  |  |  |  |  | 1 year 5 months 12 days |
Unrecognized compensation costs | $ |  |  |  | $ 2,180 |  | $ 2,180 |
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 |  |  |  |  |
Key officers | Performance Shares 3 | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target vesting percentage |  | 0.00% |  |  |  |  |
Key officers | Performance Shares 3 | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Target vesting percentage |  | 200.00% |  |  |  |  |
Director [Member] | 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 | $ 55.8 |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining shares available for issuance under the Incentive Plan (shares) | shares |  |  |  | 881,914 |  | 881,914 |
Shares issuable upon exercise of Incentive Plan awards (shares) | shares |  |  |  |  |  | 143,581 |
Employee Stock Purchase Plan (ESPP) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation costs charged to income: | $ |  |  |  | $ 127 | 114 | $ 242 | 214
Proceeds from ESPP | $ |  |  |  | $ 718 | 645 | $ 1,371 | 1,215
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 | $ |  |  |  | $ 66 | $ 60 | $ 198 | $ 177
Unrecognized compensation costs | $ |  |  |  | $ 117 |  | $ 117 |
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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