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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Schedule of primary office leases and maturity of lease liabilities
The following table summarizes our primary office leases as of December 31, 2021 (in thousands, other than term):
LocationLease Termination Term (in years)Future Minimum Lease CommitmentsLetter of Credit Amount Required
Arlington, VA10.1$35,581 $1,579 
Riverside, IL 9.341,408 232 
Edison, NJ4.32,180 222 
Pune, India1.71,382 — 
Brea, CA0.4462 — 
Maturity of lease liabilities (in thousands) as of December 31, 2021, is as follows:
Operating lease expense
202210,916 
20239,258 
20248,968 
20258,653 
20267,988 
Thereafter39,972 
Total lease payments85,755 
Less:
Interest20,964 
Present value of lease liabilities$64,791 
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 (in thousands):
For the Year Ended December 31,
202120202019
Operating lease cost$12,991 $15,848 $13,903 
Amortization of right-of-use assets— 299 598 
Interest expense— 3 26 
Variable lease cost5,036 5,097 4,177 
Total lease cost$18,027 $21,247 $18,704 
Our weighted-average discount rate and our weighted remaining lease terms (in years) are as follows:

December 31,
202120202019
Weighted average discount rate6.38 %6.44 %6.25 %
Weighted average remaining lease term8.89.49.9