Annual report pursuant to Section 13 and 15(d)

401(k) Plan

401(k) Plan
12 Months Ended
Dec. 31, 2020
Contractors [Abstract]  
401(k) Plan 401(k) Plan We maintain a defined contribution plan under Section 401(k) of the Internal Revenue Code of 1986, as amended, that covers substantially all of our employees. Under the provisions of our 401(k) plan, employees' eligible contributions are matched at rates specified in the plan documents. Our expense associated with this plan was approximately $5.9 million, $5.5 million and $5.9 million for the years ended December 31, 2020, 2019, and 2018, respectively.