7. Commitments and Contingencies

Operating Leases and Capital Leases

We lease certain facilities, vehicles, equipment, office and manufacturing space under noncancelable operating leases which expire at various dates through 2029. We are also party to month-to-month leases that can be canceled at any time. Total rent expense related to operating leases for the three and six months ended June 30, 2018 was $1.9 million and $3.7 million, respectively, compared to total rent expense of $1.8 million and $3.6 million for the three and six months ended June 30, 2017, respectively.

We also lease vehicles under capital leases. These leases are typically three years in duration and have no guaranteed residual values. Amounts included within property and equipment under capital leases as of June 30, 2018 and December 31, 2017 are as follows:


	June 30,		December 31,
	2018		2017
Cost	$	21,359	$	15,557
Accumulated depreciation		(5,282)		(2,672)
Net	$	16,077	$	12,885

The following table presents our contractual obligations for the periods subsequent to June 30, 2018, including future minimum annual lease payments, including executory costs and interest, and the payments of the liability related to the TRA:


	Operating Leases		Capital Leases		Liability related to TRA		Total
Remainder of 2018	$	3,255	$	3,622	$	—	$	6,877
2019		4,962		7,342		5,840		18,144
2020		4,374		5,387		3,168		12,929
2021		3,404		1,087		3,255		7,746
2022		2,176		—		3,331		5,507
Thereafter		5,001		—		47,395		52,396
	$	23,172	$	17,438	$	62,989	$	103,599

Legal Contingencies

We are involved in various disputes arising in the ordinary course of business. Management does not believe the outcome of these disputes will have a material adverse effect on our consolidated financial position or consolidated results of operations.