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Employee Benefit Plans
 12 Months Ended
Dec. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Employee Benefit Plans

12. Employee Benefit Plans

We maintain one active defined contribution 401(k) plan. Our employees are eligible to participate in the plan subject to certain employment eligibility provisions. Participants can contribute up to 75% of their annual compensation, subject to federally mandated maximums. Participants are immediately vested in their own contributions. We match a certain percentage of the contributions made by participating employees, subject to IRS limitations. Our matching contributions are subject to a pro-rata five-year vesting schedule. We recognized expense of $30.2 million, $8.1 million and $7.8 million in 2021, 2020 and 2019, respectively, for contributions to the plan.

We maintain one active defined benefit post-retirement plan which provides income at a defined percentage of a participant’s salary for a period after retirement. The plan is not material and is fully funded by investments segregated for the sole purpose of funding the plan.

The Company contributes to multiple collectively bargained union retirement plans including multiemployer plans. The Company does not administer the multiemployer plans, and contributions are determined in accordance with the provisions of negotiated labor contracts. The risks of participating in multiemployer plans are different from single-employer plans. Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to a multiemployer plan, the unfunded obligations of that multiemployer plan may be borne by the remaining participating employers. If the Company chooses to stop participating in a multiemployer plan, the Company may be required to pay that plan an amount (“withdrawal liability”) based on the plan’s formula and the underfunded status of the plan attributable to the Company. Contributions to the plans for the years ended December 31, 2021, 2020 and 2019 were not significant.