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Stock-Based Compensation Plans - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 09, 2020 | Jun. 14, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 29,602,000 | $ 36,763,000 | $ 20,360,000 |  |
Stock-based compensation expense, tax benefits | 5,400,000 | 5,900,000 | $ 3,900,000 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value of stock options granted (in dollars per share) |  |  | $ 7.03 |  |
Total intrinsic value of stock options exercised | 19,500,000 | 16,000,000.0 | $ 15,800,000 |  |
Unrecognized compensation costs | $ 100,000 |  |  |  |
Unrecognized compensation costs, weighted average recognition periods | 2 months 12 days |  |  |  |
Stock Options | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of award | 1 year |  |  |  |
Stock Options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of award | 10 years |  |  |  |
LTIP Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock based compensation awards, award payout range, maximum | 200.00% |  |  |  |
Number of shares vested | 668,240 |  |  |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 165,237 |  |  |  |
LTIP Performance Shares | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period | 1 year |  |  |  |
LTIP Performance Shares | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period | 3 years |  |  |  |
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 |  |  |  |
Requisite service period | 3 years |  |  |  |
Award vesting rights, incremental vesting percentage on anniversary of grant date | 33.00% |  |  |  |
Total Shareholder Return Awards (TSRs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period | 3 years |  |  |  |
Stock based compensation awards, award payout range, minimum | 0.00% |  |  |  |
Stock based compensation awards, award payout range, maximum | 200.00% |  |  |  |
Number of shares vested | 199,413 |  |  |  |
Performance shares payout rate | 93.00% |  |  |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 53,033 |  |  |  |
Unrecognized compensation costs | $ 17,600,000 |  |  |  |
Unrecognized compensation costs, weighted average recognition periods | 1 year 10 months 24 days |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares vested | 431,504 |  |  |  |
Shares withheld to pay employees' portion of minimum payroll withholding taxes | 121,564 |  |  |  |
Requisite service period | 3 years |  |  |  |
Award vesting rights, incremental vesting percentage on anniversary of grant date | 33.00% |  |  |  |
Unrecognized compensation costs | $ 18,900,000 |  |  |  |
Unrecognized compensation costs, weighted average recognition periods | 1 year 9 months 18 days |  |  |  |
Restricted Stock Units (RSUs) | Board Member |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 1 year |  |  |  |
2017 Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares of common stock reserved for issuance | 3,000,000 |  |  |  |
Purchase of common stock under the plan, employee annual base compensation, amount | $ 25,000 |  |  |  |
Purchase of common stock under the plan, employee annual base compensation, percentage | 10.00% |  |  |  |
Price of common stock purchased under ESPP, percentage | 85.00% |  |  |  |
Discount offered pursuant to ESPP, percentage | 15.00% |  |  |  |
Stock-based compensation expense | $ 700,000 | $ 600,000 | $ 500,000 |  |
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 |
2016 Equity and Performance Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares of common stock reserved for issuance | 8,000,000 |  |  |  |
Maximum aggregate number of shares allowed per participant during any calendar year | 3,000,000 |  |  |  |
Maximum aggregate value allowed per participant on the date of grant during any calendar year | $ 9,000,000 |  |  |  |
2005 Equity and Performance Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares of common stock reserved for issuance |  |  |  |  | 23,250,000

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- Definition Contractual term for options outstanding and currently exercisable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Estimated period over which awards are earned, if at all, based upon the achievement of performance goals as determined by the company in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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