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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Commitments and Contingencies | Commitments and Contingencies The Company leases land, buildings and tower space under various non-cancelable agreements, which expire between the years 2019 and 2043 and require various minimum annual rental payments. These leases typically include renewal options and escalation clauses. In general, tower leases have five or ten year initial terms with four renewal terms of five years each. The other leases generally contain certain renewal options for periods ranging from five to twenty years. Future minimum lease payments under non-cancelable operating leases, including renewals that are reasonably assured at the inception of the lease, with initial variable lease terms in excess of one year as of December 31, 2018, are as follows:
Year Ending |  | Amount
(in thousands) |  |
2019 |  | $ | 55,050 |
2020 |  | 53,100 |
2021 |  | 51,323 |
2022 |  | 49,573 |
2023 |  | 48,000 |
2024 and after |  | 168,498 |
|  | $ | 425,544 |
The Company’s total rent expense under operating leases was $59.6 million, $53.1 million, and $43.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. Certain operating leases contain rent escalation clauses, which are recorded on a straight-line basis over the lease term which includes renewals that are reasonably assured at lease inception, with the difference between the rent paid and the straight-line rent recorded as a deferred rent liability. Lease incentives received from landlords are recorded as deferred rent liabilities and are amortized on a straight-line basis over the lease term as a reduction to rent expense. As lessor, the Company has leased buildings, tower space and telecommunications equipment to other entities under various non-cancelable agreements, which require various minimum annual payments. The total minimum rental receipts under lease agreements at December 31, 2018 are as follows:
Year Ending |  | Amount
(in thousands) |  |
2019 |  | $ | 7,067 |
2020 |  | 6,109 |
2021 |  | 4,042 |
2022 |  | 2,914 |
2023 |  | 1,345 |
2024 and after |  | 4,400 |
|  | $ | 25,877 |
Legal Proceedings From time to time the Company is involved in various litigation matters arising out of the normal course of business. The Company consults with legal counsel on those issues related to litigation and seeks input from other experts and advisers with respect to such matters. Estimating the probable losses or a range of probable losses resulting from litigation, government actions and other legal proceedings is inherently difficult and requires an extensive degree of judgment, particularly where the matters involve indeterminate claims for monetary damages, may involve discretionary amounts, present novel legal theories, are in the early stages of the proceedings, or are subject to appeal. Whether any losses, damages or remedies ultimately resulting from such matters could reasonably have a material effect on the Company's business, financial condition, results of operations, or cash flows will depend on a number of variables, including, for example, the timing and amount of such losses or damages (if any) and the structure and type of any such remedies. The Company's management does not presently expect any litigation matters to have a material adverse impact on the consolidated financial statements of the Company. Legal fees are expensed as incurred.

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