Description of Business and Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Summary of Property and Equipment, Estimated Useful Lives

Depreciation is computed using the straight-line method, except for tractors (included in revenue equipment) for which the declining-balance method is used. The following service lives are used to compute depreciation:

	Years
Structures	15 to 25
Revenue equipment	6 to 20
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):

	2024		2023
Land	$	350,593	$	272,633
Structures		1,238,969		813,146
Revenue equipment		1,810,389		1,470,913
Technology equipment and software		225,504		176,854
Other		164,614		148,254
Total property and equipment, at cost	$	3,790,069	$	2,881,800

Schedule of Measure of Segment Assets

The following table presents selected financial information with respect to the Company’s single reportable segment (in thousands):

	For The Years Ended December 31,
	2024			2023			2022
Revenue	$	3,209,074		$	2,881,433		$	2,792,057
Less:
Wages (a)		907,750			767,282			689,342
Salaries (a)		190,393			168,794			149,837
Purchased Transportation		237,306			238,688			315,896
Other Segment items (b)		1,179,631			1,065,270			1,009,337
Depreciation and Amortization		210,105			178,845			157,203
Interest Expense		8,930			2,535			2,611
Interest Income		(1,049	)		(6,208	)		(217	)
Income Tax Expense		113,943			111,370			110,626
Segment and Consolidated Net Income	$	362,065		$	354,857		$	357,422

(a) Wages includes payroll costs for non-management employees generally paid on an hourly or per-mile basis. Salaries includes payroll costs for exempt employees.

(b) Other segment items include employees' benefits, fuel, operating expenses and supplies, operating taxes and licenses and claims and insurance.