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Stock-Based Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 09, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 8,061 | $ 9,371 | $ 22,943 | $ 30,328 |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Incentive plan, total intrinsic value of stock options exercised |  |  | 14,300 | $ 6,900 |
Unrecognized compensation costs | $ 100 |  | $ 100 |  |
Unrecognized compensation costs, weighted average recognition period |  |  | 4 months 24 days |  |
LTIP Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares vested |  |  | 668,240 |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 165,237 |  |
Restricted Share Awards (RSAs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares vested |  |  | 88,913 |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 28,233 |  |
Total Shareholder Return Awards (TSRs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares vested |  |  | 199,413 |  |
Payout rate | 93.00% |  | 93.00% |  |
Vesting performance period |  |  | 3 years |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 53,033 |  |
Unrecognized compensation costs | $ 23,500 |  | $ 23,500 |  |
Unrecognized compensation costs, weighted average recognition period |  |  | 1 year 8 months 12 days |  |
Total Shareholder Return Awards (TSRs) | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payout rate | 0.00% |  | 0.00% |  |
Total Shareholder Return Awards (TSRs) | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payout rate | 200.00% |  | 200.00% |  |
Restricted Share Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares vested |  |  | 403,865 |  |
Vesting performance period |  |  | 3 years |  |
Award vesting rights percentage |  |  | 33.00% |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 110,689 |  |
Unrecognized compensation costs | $ 26,100 |  | $ 26,100 |  |
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 |  |  | 114,709 | 92,765 |
2020 Equity and Incentive Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant |  |  |  |  | 6,658,754
Stock-based compensation expense | 8,100 | 9,300 | $ 22,900 | $ 30,300 |
Stock-based compensation expense, tax benefits | $ 1,400 | $ 1,500 | $ 4,200 | $ 5,500 |

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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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