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Accrued Liabilities
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
The components of accrued liabilities were as follows:

March 31, 2021December 31, 2020
Accrued compensation and benefits
$54,498 $49,238 
Miscellaneous accrued liabilities
10,969 9,722 
Payroll tax liability deferred by the CARES Act6,812 6,812 
Customer contract liabilities3,475 3,688 
Total accrued liabilities
$75,754 $69,460