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Property and Equipment
 12 Months Ended
Dec. 31, 2023
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		20232022
Land—$10,351 $10,226 
Buildings and improvements
3 to 39
44,352 40,480 
Construction equipment
3 to 12
578,563 519,421 
Office equipment
3 to 10
16,177 14,801 
649,443 584,928 
Less: accumulated depreciation and amortization(380,465)(351,753)
$268,978 $233,175 
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, 2023, 2022 and 2021 was $54.2 million, $49.2 million and $43.9 million, respectively.