The Company leases office facilities under non-cancelable operating leases that expire at various dates through February 2035.

During the six months ended June 30, 2022, the lease term began, was amended, or extended for various leases of office spaces globally. The Company recorded a net $6.1 million of right-of-use assets and $6.1 million of lease liabilities for these leases during the period upon the lease commencement, amendment, or extension.

The Company uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of operating lease payments. To determine the estimated incremental borrowing rate, the Company uses publicly available credit ratings for peer companies. The Company estimates the incremental borrowing rate using yields for maturities that are in line with the duration of the lease payments. The weighted average discount rate for operating leases as of June 30, 2022 was 4.9%.

Operating lease expense costs were $10.8 million for the three months ended June 30, 2022, $21.7 million for the six months ended June 30, 2022, $11.9 million for the three months ended June 30, 2021, and $24.0 million for the six months ended June 30, 2021.

The Company subleases some of its unused spaces to third parties. Operating sublease income generated under all operating lease agreements for the three and six months ended June 30, 2022 and 2021 are as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
	(in thousands)				(in thousands)
Operating sublease income	$	1,100	$	1,247	$	2,288	$	2,506

Cash payments related to operating lease liabilities were $13.3 million for the three months ended June 30, 2022, $20.9 million for the six months ended June 30, 2022, $14.0 million for the three months ended June 30, 2021, and $26.1 million for the six months ended June 30, 2021.