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Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]  
Schedule of Accrued Liabilities
Accrued expenses consisted of the following (in thousands):
 
 December 31,
 20202019
Accrued contract payments$101,705 $15,706 
Accrued compensation and related liabilities57,201 8,941 
Other23,560 9,788 
Accrued cash settled stock-based compensation19,376 3,282 
Union pension obligation
6,632 — 
Accrued interest4,927 228 
Accrued legal fees3,228 788 
Accrued income taxes2,042 — 
Total accrued expenses$218,671 $38,733 

The CARES Act (discussed in Note 21, Income Taxes) provides for deferred payment of the employer portion of social
security (FICA) taxes through the end of 2020, with 50% of the deferred amount due by December 31, 2021 and the remaining 50% due by December 31, 2022. The Accrued compensation and related liabilities amount includes $20.8 million related to this deferral.