We lease 434 sites from third parties under certain non-cancelable operating leases that expire from time to time through 2044. The weighted-average remaining lease term was 3.9 years as of December 31, 2024.

Lease expense was classified in the consolidated statements of income as follows (in thousands):


	Year Ended December 31,
	2024		2023		2022
Cost of sales	$	20,651	$	22,338	$	23,457
Operating expenses		17,440		15,460		15,254
General and administrative expenses		1,179		995		931
Total	$	39,270	$	38,793	$	39,642

Variable lease payments based on inflation or fuel volume included in the table above totaled $4.6 million, $4.6 million and $4.4 million for 2024, 2023 and 2022, respectively. Short-term lease payments included in the table above that are excluded from the lease liability amounted to $0.3 million, $0.2 million and $0.2 million for 2024, 2023 and 2022, respectively. Cash paid for amounts included in the measurement of lease liabilities under operating leases totaled $34.4 million, $34.0 million and $35.0 million for 2024, 2023 and 2022, respectively.

As of December 31, 2024, future minimum rental payments under operating leases, excluding variable lease payments or short-term payments, were as follows (in thousands). The weighted-average discount rate as of December 31, 2024 and 2023 was 5.8%.


	Third Parties		Related Parties		Total
2025	$	26,059	$	10,163	$	36,222
2026		23,060		10,254		33,314
2027		18,853		8,810		27,663
2028		14,513		8,237		22,750
2029		11,902		7,327		19,229
Thereafter		27,335		1,838		29,173
Total future payments	$	121,722	$	46,629		168,351
Less impact of discounting						26,990
						141,361
Current portion						35,065
Long-term portion					$	106,296

Most lease agreements include provisions for renewals. We generally do not include renewal options in our lease term for purposes of measuring our lease liabilities and right-of-use assets unless the sublease to our customer extends beyond the term of the head lease.

Of our leased sites, we operate 152 of them as company operated sites. Substantially all the remaining leased sites are subleased to lessee dealers or commission agents under leases with terms generally ranging from one to ten years and which may include renewal options. Sublease rental income amounted to $31.3 million, $35.3 million and $35.4 million for 2024, 2023 and 2022, respectively.

Motor fuel stations are leased to tenants under operating leases with various expiration dates ranging through 2041. Most lease agreements include provisions for renewals. We generally do not include renewal options in our lease term. Future minimum rental payments under non-cancelable operating leases with third parties as of December 31, 2024 were as follows (in thousands):


2025	$	35,082
2026		26,004
2027		15,428
2028		9,066
2029		7,294
Thereafter		17,160
Total future minimum lease payments	$	110,034

The future minimum rental payments presented above do not include contingent rent based on future inflation, future revenues or volumes of the lessee, or non-lease components for amounts that may be received as tenant reimbursements for certain operating costs.

Deferred rent income from straight-line rent relates to the cumulative amount by which straight-line rental income recorded to date exceeds cash rents billed to date under the lease agreement and totaled $2.6 million and $5.0 million at December 31, 2024 and 2023, respectively.