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Stock-Based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 9,371 | $ 6,575 | $ 30,328 | $ 20,642
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incentive plan, weighted average grant date fair value of stock options granted (in dollars per share) |  |  |  | $ 7.03
Incentive plan, total intrinsic value of stock options exercised |  |  | 6,900 | $ 13,600
Unrecognized compensation costs | 500 |  | $ 500 |
Unrecognized compensation costs, weighted average recognition period |  |  | 6 months |
LTIP Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense, additional expense due to changes in expected attainment rates |  |  | $ 6,000 |
Unrecognized compensation costs | 2,400 |  | $ 2,400 |
Unrecognized compensation costs, weighted average recognition period |  |  | 6 months |
Restricted Share Awards (RSAs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested |  |  | 106,610 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 32,371 |
Unrecognized compensation costs | 800 |  | $ 800 |
Unrecognized compensation costs, weighted average recognition period |  |  | 4 months 24 days |
Total Shareholder Return Awards (TSRs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs | 23,200 |  | $ 23,200 |
Unrecognized compensation costs, weighted average recognition period |  |  | 1 year 10 months 24 days |
Restricted Share Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested |  |  | 259,634 |
Shares withheld to pay employees' portion of minimum payroll withholding taxes |  |  | 57,802 |
Unrecognized compensation costs | 23,900 |  | $ 23,900 |
Unrecognized compensation costs, weighted average recognition period |  |  | 1 year 7 months 6 days |
2017 Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under ESPP |  |  | 92,765 | 112,549
2016 Equity and Performance Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 9,300 | 6,500 | $ 30,300 | $ 20,600
Stock-based compensation expense, tax benefits | $ 1,500 | $ 1,500 | $ 5,500 | $ 3,600

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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=116856206&loc=d3e5070-113901 + Details
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