
15.	Commitments and Contingencies

We lease office and warehouse facilities, vehicles and office equipment under operating lease agreements, which include both monthly and longer-term arrangements. Leases with initial terms of one year or more expire at various dates through 2025 and generally provide for extension options. Rent expense under the leasing agreements (exclusive of real estate taxes, insurance and other expenses payable under the leases) amounted to $21,566, $18,640 and $17,804 in 2017, 2016 and 2015, respectively.

The minimum rentals for aggregate lease commitments as of December 31, 2017, were as follows:



2018	$	14,083
2019	9,540
2020	5,721
2021	2,995
2022	1,996
Thereafter	2,596
Total	$	36,931

Certain operating leases for vehicles contain residual value guarantee provisions, which would become due at the expiration of the operating lease agreement if the fair value of the leased vehicles is less than the guaranteed residual value. The aggregate residual value at lease expiration of those leases is $14,052, of which we have guaranteed $11,409. As of December 31, 2017, we have recorded a liability for the estimated end-of-term loss related to this residual value guarantee of $509 for certain vehicles within our fleet. Our fleet also contains vehicles we estimate will settle at a gain. Gains on these vehicles will be recognized at the end of the lease term.

In the ordinary course of business, we may become liable with respect to pending and threatened litigation, tax, environmental and other matters. While the ultimate results of current claims, investigations and lawsuits involving us are unknown at this time, we do not expect that these matters will have a material adverse effect on our consolidated financial position or results of operations. Legal costs associated with such matters are expensed as incurred.