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Leases (Tables) | 12 Months Ended
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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):
Location |  | Lease Termination Term (in years) |  | Future Minimum Lease Commitments |  | Letter of Credit Amount Required
Arlington, VA |  | 10.1 |  | $ | 35,581 |  |  | $ | 1,579 |
Riverside, IL |  | 9.3 |  | 41,408 |  |  | 232 |
Edison, NJ |  | 4.3 |  | 2,180 |  |  | 222 |
Pune, India |  | 1.7 |  | 1,382 |  |  | — |
Brea, CA |  | 0.4 |  | 462 |  |  | — |
Maturity of lease liabilities (in thousands) as of December 31, 2021, is as follows:
| Operating lease expense
2022 | 10,916 |
2023 | 9,258 |
2024 | 8,968 |
2025 | 8,653 |
2026 | 7,988 |
Thereafter | 39,972 |
Total lease payments | 85,755 |
Less: |
Interest | 20,964 |
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,
| 2021 |  | 2020 |  | 2019
Operating lease cost | $ | 12,991 |  |  | $ | 15,848 |  |  | $ | 13,903 |
Amortization of right-of-use assets | — |  |  | 299 |  |  | 598 |
Interest expense | — |  |  | 3 |  |  | 26 |
Variable lease cost | 5,036 |  |  | 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,
| 2021 |  | 2020 |  | 2019
Weighted average discount rate | 6.38 | % |  | 6.44 | % |  | 6.25 | %
Weighted average remaining lease term | 8.8 |  | 9.4 |  | 9.9

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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