XML 28 R14.htm IDEA: XBRL DOCUMENT v3.22.0.1
Property and Equipment
 12 Months Ended
Dec. 31, 2021
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		20212020
Land—$10,226 $9,301 
Buildings and improvements
3 to 39
35,600 33,452 
Construction equipment
3 to 12
455,011 420,002 
Office equipment
3 to 10
17,383 16,725 
518,220 479,480 
Less: accumulated depreciation and amortization(322,128)(294,366)
$196,092 $185,114 
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, 2021, 2020 and 2019 was $43.9 million, $42.9 million and $40.7 million, respectively.