NOTE L — LEASES

Rent expense under operating leases was approximately $47.5 million, $47.3 million, and $48.1 million for the years ended December 31, 2018, 2017, and 2016, respectively, which was included within “Other operating costs” and “General and administrative expenses” in our consolidated statements of operations. Sublease rental income is not material. The net book value of office equipment under capital leases was approximately $0.5 million and $0.7 million at December 31, 2018 and 2017, respectively. Equipment capital lease obligations are included in long-term debt as a part of “Financing leases and other” in Note M - “Long-Term Debt.”

Future minimum rental payments, by year and in the aggregate, under operating and financing obligations with terms of one year or more at December 31, 2018 are as follows:


	Operating		Capital
(in thousands)	Leases		Leases

2019	$	39,378	$	249
2020		29,641		175
2021		21,303		109
2022		14,479		28
2023		9,193		—
Thereafter		10,008		—
	$	124,002	$	561