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Share-Based Payments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 16, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Recognized stock-based compensation expense | $ 16,815 | $ 15,897 | $ 13,588 | $ 16,800 | $ 15,900 | $ 13,600 |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | 100 |  |  | 100 |  |  |
RSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ 34,500 |  |  | $ 34,500 |  |  |
LTIP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 7,000,000
Common stock, shares delivered (in shares) |  |  |  | 508,968 | 433,585 | 378,855 |
LTIP | RSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock units vested (in shares) |  |  |  | 877,262 | 730,980 | 741,210 |
Adjustments to additional paid in capital, income tax deficiency from share-based compensation |  |  |  | $ 6,500 | $ 5,000 | $ 4,800 |

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