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Defined Contribution Plan
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Defined Contribution Plan Defined Contribution Plan
We maintain defined contribution 401(k) plans covering eligible U.S. employees, who may contribute up to 100% of their compensation, subject to limitations established by the Internal Revenue Code. We match employee contributions on a discretionary basis. Expense for our matching contributions was $14.6 million, $14.7 million and $13.5 million during 2020, 2019 and 2018, respectively.
We maintain defined contribution benefit plans covering eligible foreign employees. Expense related to such plans was not material in any period presented.