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Stock-Based Compensation - Performance Share Units and Performance Share Awards (Details) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 $ / shares shares | Jan. 01, 2020 $ / shares shares | Jan. 01, 2019 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2016 shares
Stock-based compensation |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 13,100 | $ 10,000 | $ 7,800 |  |
Period for recognition of unrecognized compensation expense |  |  |  | 7 months 6 days |  |  |  |
Performance Share Units |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Ratio of common stock for each vested award |  |  |  | 1 |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested as of beginning of period (in shares) | 857,282 | 695,316 | 504,497 | 857,282 | 695,316 | 504,497 |  |
Granted (in shares) |  |  |  | 376,810 | 340,758 | 310,696 |  |
Vested (in shares) |  |  |  | (214,163) | (172,167) | (36,342) |  |
Forfeited (in shares) |  |  |  | (77,423) | (6,625) | (83,535) |  |
Unvested as of end of period (in shares) |  |  |  | 942,506 | 857,282 | 695,316 | 504,497 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Transfer Restrictions |  |  |  |  |  |  | 6 months |
Transfer restrictions, period |  |  |  |  |  |  | 6 months |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unvested as of beginning of period (in dollars per share) | $ / shares | $ 25.43 | $ 26.46 | $ 25.93 | $ 25.43 | $ 26.46 | $ 25.93 |  |
Granted (in dollars per share) | $ / shares |  |  |  | 27.07 | 25.96 | 27.04 |  |
Vested (in dollars per share) | $ / shares |  |  |  | 22.57 | 29.95 | 24.51 |  |
Forfeited (in dollars per share) | $ / shares |  |  |  | 24.62 | 26.13 | 26.37 |  |
Unvested as of end of period (in dollars per share) | $ / shares |  |  |  | $ 26.70 | $ 25.43 | $ 26.46 | $ 25.93 |
Stock-based compensation |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  | $ 6,100 | $ 6,200 | $ 5,600 |  |
Period for recognition of unrecognized compensation expense |  |  |  | 1 year 2 months 12 days |  |  |  |
Total fair value of vested shares (in dollars) | $ |  |  |  | $ 4,800 | $ 5,200 | $ 900 |  |
Performance Share Units | Key employees |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 376,810 | 340,758 | 310,696 |  |
Minimum |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Performance achieved, percentage of PSUs earned and vested |  |  |  | 0 |  |  |  |
Performance achieved, percentage of PSAs earned and vested |  |  |  | 0 |  |  |  |
Maximum |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Performance achieved, percentage of PSUs earned and vested |  |  |  | 200 |  |  |  |
Performance achieved, percentage of PSAs earned and vested |  |  |  | 200 |  |  |  |
IPO | Performance Share Units |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 115,566
IPO | Performance Share Units | Tranche one |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Vesting (as a percent) |  |  |  |  |  |  |  | 33.33%
IPO | Performance Share Units | Tranche two |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Vesting (as a percent) |  |  |  |  |  |  |  | 33.33%
IPO | Performance Share Units | Tranche three |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Vesting (as a percent) |  |  |  |  |  |  |  | 33.33%
LongTerm Incentive Plan |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Performance period | 3 years | 3 years | 3 years | 3 years |  |  |  |

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