Leases

The Company leases certain property, plant and equipment under operating leases, primarily consisting of railroad equipment leases. Net minimum future rental payments due under non-cancelable operating leases with remaining terms in excess of one year as of December 31, 2017 are as follows:

2018	$	11,404
2019		12,272
2020		16,239
2021		16,393
2022		13,660
Thereafter		24,660
Total	$	94,628

Leases of railroad equipment generally provide for renewal options at their fair rental value at the time of renewal. In the normal course of business, operating leases for railroad equipment are generally renewed or replaced by other leases. For the years ended December 31, 2018, 2019 and 2020, minimum future rental payments in the table above are presented net of sublease income related to subleases of railroad equipment of $3,933, $2,853 and $440, respectively. Rent expense for all operating leases was $20,310 in 2017, $22,040 in 2016 and $23,757 in 2015. For the years ended December 31, 2017, 2016 and 2015, rent expense is stated net of sublease income of $3,040, $4,778 and $5,031, respectively.