Leases and Commitments (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Schedule of Capital Leased Assets

Balances related to these capitalized leases are included in "Property and equipment" line items in the accompanying consolidated balance sheets and are set forth in the table below for the periods indicated (in thousands).

	Capitalized Costs		Accumulated Amortization		Net Book Value
December 31, 2018	$	87,910	$	16,415	$	71,495
December 31, 2017	66,785		23,254		43,531

Lessee, Operating Lease, Disclosure

set forth in the table below for the periods indicated (in thousands):

	Year Ended December 31,
	2018		2017		2016
Equipment rent (1)	$	10,840	$	10,173	$	7,443
Building and office rent (2)	1,586		1,619		2,001
Total rent expense	$	12,426	$	11,792	$	9,444

1.Expense relating to tractors, trailers and other operating equipment is recorded in the "Equipment rent" line item in the accompanying consolidated statement of operations and comprehensive income (loss). 

2.Expense relating to buildings and office equipment is recorded in the "Operations and maintenance" line item in the accompanying consolidated statement of operations and comprehensive income (loss).

Schedule of Future Minimum Lease Payments for Capital Leases

As of December 31, 2018, the future minimum payments including interest under capitalized leases with initial terms of one year or more and future rentals under operating leases for certain facilities, office equipment and revenue equipment with initial terms of one year or more were as follows for the years indicated (in thousands). 

	2019		2020		2021		2022		2023		Thereafter
Future minimum payments	$	19,319	$	22,833	$	7,328	$	7,328	$	18,648	$	2,566
Future rentals under operating leases	9,088		5,370		1,308		920		708		1,358