Retirement Plan

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Retirement Plan

Note 13. Retirement Plan

We maintain a defined contribution plan covering shoreside employees. Effective January 1, 2016, we commenced annual, non-elective contributions to the plan on behalf of all eligible participants equal to 3% of participants' eligible earnings. Additional annual contributions to the plan are discretionary and are based on fixed percentages of participants' salaries and years of service, not to exceed certain maximums. Contribution expenses were $17.9 million, $18.4 million and $21.2 million for the years ended December 31, 2021, 2020 and 2019, respectively.