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Properties And Equipment
12 Months Ended
Dec. 31, 2023
Properties And Equipment [Abstract]  
Properties And Equipment

13.    Properties and Equipment

A summary of properties and equipment follows (in thousands):

December 31,

2023

2022

Land

$

14,356 

$

11,862 

Buildings and building improvements

130,695 

123,845 

Transportation equipment

89,910 

79,810 

Machinery and equipment

164,249 

154,603 

Computer software

72,646 

69,283 

Furniture and fixtures

78,068 

76,042 

Projects under development

8,788 

20,189 

Total properties and equipment

558,712 

535,634 

Less accumulated depreciation

(354,872)

(335,920)

Net properties and equipment

$

203,840 

$

199,714 

The net book value of computer software at December 31, 2023 and 2022, was $8.0 million and $8.9 million, respectively. Depreciation expense for computer software was $4.5 million, $5.5 million and $5.8 million for the years ended December 31, 2023, 2022 and 2021, respectively.