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Share-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | $ 9,214 | $ 8,827 | $ 7,872
Total recognized tax deficiency related to share-based compensation | (783) | (217) | (293)
Selling, general & administrative expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | 9,160 | 8,767 | 7,718
Costs of services provided |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | 54 | 60 | 154
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | 1,253 | 1,832 | 2,134
Restricted stock, restricted stock units and deferred stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | 6,972 | 6,367 | 5,195
Performance stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | 819 | 401 | 0
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax share-based compensation expense charged against income | $ 170 | $ 227 | $ 543

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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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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + 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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