Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Disaggregated Revenue

We have one operating segment and no single customer exceeds 6% of our revenue. The composition of our revenue is summarized below:

	Year Ended December 31,
In thousands)	2021		2020		2019
LTL services	$	5,177,497	$	3,961,054	$	4,055,467
Other services		78,831		54,075		53,644
Total revenue	$	5,256,328	$	4,015,129	$	4,109,111

Estimated Useful Lives of Property and Equipment

Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The following table provides the estimated useful lives by asset type:

Structures	7 to 30 years
Revenue equipment	4 to 15 years
Other equipment	2 to 20 years
Leasehold improvements	Lesser of economic life or life of lease