Description of Business and Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Summary of Property and Equipment, Estimated Useful Lives

Depreciation is computed using the straight-line method based on the following service lives:

	Years
Structures	20 to 25
Tractors	6 to 10
Trailers	10 to 14
Other revenue equipment	7 to 14
Technology equipment and software	3 to 5
Other	3 to 10

Schedule of Property and Equipment

At December 31, property and equipment consisted of the following (in thousands):

	2020		2019
Land	$	116,187	$	106,024
Structures		440,015		389,096
Tractors		583,711		524,901
Trailers		426,000		411,269
Other revenue equipment		96,912		92,875
Technology equipment and software		141,735		127,408
Other		96,684		87,649
Total property and equipment, at cost	$	1,901,244	$	1,739,222

Summary of Risk Retention Amounts Per Occurrence

Risk retention amounts per occurrence during the three years ended December 31, 2020, were as follows:

Workers’ compensation	$	1,000,000
Bodily injury and property damage (1)		2,000,000
Employee medical and hospitalization		400,000
Cargo loss and damage		250,000
(1) $10 million for period March 1, 2018 - February 28, 2019.