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Equity Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Restricted stock and deferred restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation costs | $ 7,618 |
Recognition period for unrecognized compensation cost | 2 years 1 month 20 days |
Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of equity instruments granted (in shares) | 31,399 | 33,701
Service-based restricted stock vesting period | 1 year | 3 years
Grant date fair value of equity instruments granted (usd per share) | $ 68.37 | $ 64.22
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of equity instruments granted (in shares) | 33,621 | 29,459
Grant date fair value of equity instruments granted (usd per share) | $ 70.35 | $ 66.35
Performance Shares | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Target vesting percentage | 0.00% |
Performance Shares | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Target vesting percentage | 150.00% |
Market-based RSU | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Target vesting percentage | 0.00% |
Market-based RSU | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Target vesting percentage | 200.00% |
Incentive Plan | Restricted stock and deferred restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issuable upon exercise of Incentive Plan awards (in shares) | 179,833 |
Remaining shares available for issuance under the Incentive Plan (in shares) | 625,071 |
Employee Stock Purchase Plan (ESPP) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation costs | $ 132 |
Plan expense | $ 93 | $ 88

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://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=120381028&loc=d3e5070-113901 + Details
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