Leases

Rental expense for operating leases was $18.2 million, $19.3 million, and $18.2 million for the years ended December 31, 2018, 2017, and 2016, respectively. Sublease rental income was not material in any of the periods presented.

During the year ended December 31, 2018, we recorded two new capital leases for distribution centers with initial lease terms of 13 and 20 years, respectively, in the amount of $18.9 million, which represents non-cash investing and financing activities. At December 31, 2018, and 2017, we had $23.7 million and $4.9 million, respectively, of gross capital lease assets recorded in "Property and equipment, net" on our Consolidated Balance Sheets. Capital lease obligations are recorded in "Other long-term liabilities" on our Consolidated Balance Sheets.

As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows (in thousands):



	Operating Leases		Capital Leases
	(thousands)
2019	$	13,222	$	2,578
2020	12,734		2,617
2021	11,595		2,656
2022	10,208		2,694
2023	9,800		2,740
Thereafter	40,381		30,177
Total	$	97,940	43,462
Less - interest on capital lease obligations			(20,838		)
Total principal payable on capital lease obligations			22,624
Less - current obligations			(703		)
Long-term capital lease obligations			$	21,921

These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.