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Share-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | $ 2,058 | $ 2,396
Selling, general & administrative expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 2,033 | 2,365
Costs of services provided |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 25 | 31
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 212 | 314
Restricted stock, restricted stock units and deferred stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 1,514 | 1,785
Performance stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 247 | 199
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | $ 85 | $ 98

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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