Description of Business and Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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	10 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):

	2015		2014
Land	$	57,506	$	53,632
Structures		181,769		140,206
Tractors		314,326		290,718
Trailers		256,494		237,262
Other revenue equipment		36,828		37,220
Technology equipment and software		72,707		63,773
Other		75,884		68,334
Total property and equipment, at cost	$	995,514	$	891,145

Summary of Risk Retention Amounts Per Occurrence

Risk retention amounts per occurrence during the three years ended December 31, 2015, were as follows:

Workers’ compensation	$	1,000,000
Bodily injury and property damage		2,000,000
Employee medical and hospitalization		350,000
Cargo loss and damage		250,000