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Leases (Tables)
 6 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Schedule of maturity of lease liabilities
The following table summarizes our primary office leases as of June 30, 2021 (in thousands, other than term):
LocationLease Termination Term (in years)Future Minimum Lease CommitmentsLetter of Credit Amount Required
Arlington, VA10.6$37,147 $1,579 
Riverside, IL 9.842,956 232 
Pune, India2.31,835 — 
Brea, CA0.91,015 — 
Maturity of lease liabilities (in thousands) as of June 30, 2021, is as follows:
Operating lease expense
20215,854 
20229,832 
20238,645 
20248,378 
20258,145 
Thereafter47,761 
Total lease payments88,615 
Less:
Interest22,732 
Present value of lease liabilities$65,883 
Schedule of components of lease expense, weighted-average discount rate and weighted-remaining lease terms
The following table summarizes the components of our lease expense for the three and six months ended June 30, 2021 and 2020 (in thousands):
For the Three Months Ended June 30,For the Six Months Ended June 30,
2021202020212020
Operating lease cost$2,437 $3,586 $7,255 $6,642 
Amortization of right-of-use assets— 150 — 299 
Interest expense— 1 — 3 
Variable lease cost1,192 1,465 2,513 2,517 
Total lease cost$3,629 $5,202 $9,768 $9,461 
Our weighted-average discount rate and our weighted remaining lease terms (in years) as of June 30, 2021 are as follows:

Weighted average discount rate6.43 %
Weighted average remaining lease term9.2