Commitments and Contingencies Leases We lease certain facilities under non-cancelable operating and capital leases. These leases expire at various dates through 2050 . Certain lease commitments contain fixed payment increases at predetermined intervals over the life of the lease, while other lease commitments are subject to escalation clauses of an amount equal to the increase in the cost of living based on the Consumer Price Index - U.S. Cities Average - All Items for all Urban Consumers published by the U.S. Department of Labor, or a substantially equivalent regional index. Lease expense related to operating leases is recognized on a straight-line basis over the life of the lease. The minimum lease payments under our operating and capital leases after December 31, 2018 are as follows (in millions): Year Ending December 31, 2019 $ 43.6 2020 40.6 2021 38.3 2022 35.8 2023 29.8 Thereafter 276.8 Total minimum lease payments 464.9 Less: sublease rentals (10.3 ) $ 454.6 Rent expense, net of sublease income, for all operating leases was $43.3 million , $33.4 million , and $26.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. These amounts are included as a component of selling, general and administrative expenses in our Consolidated Statements of Operations. In connection with dispositions of stores, we occasionally assign or sublet our interests in any real property leases associated with such stores to the purchaser. We often retain responsibility for the performance of certain obligations under such leases to the extent that the assignee or sublessee does not perform. Additionally, we may remain subject to the terms of any guarantees and have correlating indemnification rights against the assignee or sublessee in the event of non-performance, as well as certain other defenses. We may also be called upon to perform other obligations under these leases, such as environmental remediation of the premises or repairs upon termination of the lease. We currently have no reason to believe that we will be called upon to perform any such services; however, there can be no assurance that any future performance required by us under these leases will not have a material adverse effect on our financial condition or results of operations. Charge-Backs for Various Contracts We have recorded a liability of $56.0 million as of December 31, 2018 for our estimated contractual obligations related to potential charge-backs for vehicle service contracts, lifetime oil change contracts and other various insurance contracts that are terminated early by the customer. We estimate that the charge-backs will be paid out as follows (in millions): Year Ending December 31, 2019 $ 30.7 2020 16.0 2021 6.6 2022 2.2 2023 0.5 Thereafter  Total $ 56.0 Lifetime Lube, Oil and Filter Contracts We retain the obligation for lifetime lube, oil and filter service contracts sold to our customers and assumed the liability of certain existing lifetime lube, oil and filter contracts. These amounts are recorded as a contract liability. At the time of sale, we defer the full sale price and recognize the revenue based on the rate we expect future costs to be incurred. As of December 31, 2018 , we had a contract liability balance of $150.5 million associated with these contracts and estimate the contract liability will be recognized as follows (in millions): Year Ending December 31, 2019 $ 30.1 2020 23.9 2021 19.0 2022 15.8 2023 13.4 Thereafter 48.3 Total $ 150.5 The contract liability balance is recorded as components of deferred revenue and accrued liabilities in our Consolidated Balance Sheets. We periodically evaluate the estimated future costs of these assumed contracts and record a charge if future expected claim and cancellation costs exceed the contract liability to be recognized. As of December 31, 2018 , we had a reserve balance of $3.4 million recorded as a component of accrued liabilities and other long-term liabilities in our Consolidated Balance Sheets. The charges associated with this reserve were recognized in 2011 and earlier. Self-insurance Programs We self-insure a portion of our property and casualty insurance, vehicle open lot coverage, medical insurance and workers compensation insurance. Third parties are engaged to assist in estimating the loss exposure related to the self-retained portion of the risk associated with these insurances. Additionally, we analyze our historical loss and claims experience to estimate the loss exposure associated with these programs. As of December 31, 2018 and 2017 , we had liabilities associated with these programs of $39.9 million and $31.2 million , respectively, recorded as a component of accrued liabilities and other long-term liabilities in our Consolidated Balance Sheets. Litigation We are party to numerous legal proceedings arising in the normal course of our business. Although we do not anticipate that the resolution of legal proceedings arising in the normal course of business will have a material adverse effect on our business, results of operations, financial condition, or cash flows, we cannot predict this with certainty.