Property and Equipment

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment consisted of the following at December 31:

(dollars in thousands)	Estimated Useful Life in Years	2022		2021
Land	—	$	10,226	$	10,226
Buildings and improvements	3 to 39	40,480		35,600
Construction equipment	3 to 12	519,421		455,011
Office equipment	3 to 10	14,801		17,383
		584,928		518,220
Less: accumulated depreciation and amortization		(351,753)		(322,128)
		$	233,175	$	196,092

Construction equipment includes assets under finance leases — see additional information provided in Note 4 — Lease Obligations to the Financial Statements.

Depreciation and amortization expense of property and equipment for the years ended December 31, 2022, 2021 and 2020 was $49.2 million, $43.9 million and $42.9 million, respectively.