Commitments and Contingencies The Company and its partner companies are involved in various claims and legal actions arising in the ordinary course of business. In the current opinion of the Company, the ultimate disposition of these matters will not have a material adverse effect on the Companys consolidated financial position or results of operations, however, no assurance can be given as to the outcome of these actions, and one or more adverse rulings could have a material adverse effect on the Companys consolidated financial position and results of operations or that of its partner companies. The Company records costs associated with legal fees as such services are rendered. The Company leases its corporate headquarters under a lease expiring in 2026 and office equipment under leases expiring at various dates to 2020. Total rental expense under operating leases was $0.5 million , $0.5 million and $0.5 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. At December 31, 2017 , future minimum lease payments under non-cancelable operating leases with initial or remaining terms of one year or more are as follows: Total (In thousands) 2018 $ 593 2019 605 2020 603 2021 598 2022 and thereafter 2,648 $ 5,047 The Company had outstanding guarantees of $3.8 million at December 31, 2017 which related to one of the Company's private equity holdings. The Company is required to return a portion or all the distributions it received as a general partner of a private equity fund for further distribution to such fund's limited partners (clawback). The Companys ownership in the fund is 19% . The clawback liability is joint and several, such that the Company may be required to fund the clawback for other general partners should they default. The Company believes its potential liability due to the possibility of default by other general partners is remote. The Company was notified by the fund's manager that the fund is being dissolved and $1.0 million of the Company's clawback liability was paid in th