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Stock-Based Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (in shares) |  |  | 0 | 0
Stock-based compensation expense | $ 6,367 | $ 8,061 | $ 20,790 | $ 22,943
Stock-based compensation expense, tax benefits | $ 900 | $ 1,400 |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incentive plan, total intrinsic value of stock options exercised |  |  | 7,800 | $ 14,300
LTIP Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 400 |
Number of shares vested (in shares) |  |  | 10,457 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes (in shares) |  |  | 4,527 |
Total Shareholder Return Awards (TSRs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) |  |  | 782,588 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes (in shares) |  |  | 205,373 |
Payout rate | 200.00% |  | 200.00% |
Vesting performance period |  |  | 3 years |
Unrecognized compensation costs | $ 21,300 |  | $ 21,300 |
Unrecognized compensation costs, weighted average recognition period |  |  | 2 years |
Restricted Share Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) |  |  | 522,608 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes (in shares) |  |  | 155,031 |
Unrecognized compensation costs | $ 23,500 |  | $ 23,500 |
Unrecognized compensation costs, weighted average recognition period |  |  | 1 year 10 months 24 days |
2017 Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under ESPP (in shares) |  |  | 86,877 | 114,709
2020 Equity and Incentive Compensation Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 20,800 | $ 22,900
Stock-based compensation expense, tax benefits |  |  | $ 3,100 | $ 4,200

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 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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