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Stock-Based Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grants in period (in shares) | 0 | 0
Stock-based compensation expense | $ 6,703 | $ 6,950
Stock-based compensation expense, tax benefits | 1,000 | 1,400
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Incentive plan, total intrinsic value of stock options exercised | 3,100 | $ 300
LTIP Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 400 |
Number of shares vested | 10,457 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 4,527 |
Total Shareholder Return Awards (TSRs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares vested | 782,588 |
Vesting performance period | 3 years |
Payout rate | 200.00% |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 205,373 |
Unrecognized compensation costs | $ 32,300 |
Unrecognized compensation costs, weighted average recognition period | 2 years 4 months 24 days |
Restricted Share Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares vested | 406,542 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 138,700 |
Unrecognized compensation costs | $ 32,400 |
Unrecognized compensation costs, weighted average recognition period | 2 years 4 months 24 days |
2017 Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under ESPP | 27,117 | 31,794

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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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