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Leases
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Leases Leases
The Company has long-term, non-cancelable operating leases for campuses and other administrative facilities. These leases generally range from 3 years to 15 years and may include renewal options to extend the lease term. In addition, the leases commonly include lease incentives in the form of rent abatements and tenant improvement allowances. The Company subleases certain portions of unused building space to third parties.
The components of lease costs were as follows for the years ended December 31, 2021, 2022, and 2023 (in thousands)
 202120222023
Lease Cost:
Operating lease cost(1)
$53,957 $28,404 $29,897 
Short-term lease cost1,768 641 360 
Sublease income(2,255)(1,135)(906)
Total lease costs$53,470 $27,910 $29,351 
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(1)During the years ended December 31, 2021, 2022 and 2023, operating lease cost includes $18.9 million, $1.2 million, and $5.1 million of right-of-use lease asset impairment charges, respectively, related to redundant leased space that was vacated during the year.
The following table provides a summary of the Company’s average lease term and discount rate as of December 31, 2022 and 2023:
As of December 31, 2022As of December 31, 2023
Weighted average remaining lease term (years)7.26.6
Weighted average discount rate4.05 %4.27 %
Supplemental information related to the Company’s leases for the years ended December 31, 2021, 2022, and 2023 (in thousands):
Year ended December 31, 2021Year ended December 31, 2022Year ended December 31, 2023
Cash paid for amounts included in the measurement of lease liabilities$43,021 $35,138 $30,742 
Right-of-use assets obtained in exchange for operating lease liabilities$79,953 $4,674 $17,921 
Maturities of lease liabilities (in thousands):
Year Ending December 31,
2024$30,151 
202529,171 
202626,796 
202723,963 
202821,129 
Thereafter44,738 
Total lease payments175,948 
Less: interest(24,023)
Present value of lease liabilities$151,925