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10-K Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment at December 31 was as follows:
20222021
Weighted Average
Depreciable Life in
Years
(In thousands)
Land$150,809 $149,066 —
Aggregate reserves592,097 584,683 *
Buildings and improvements165,833 149,262 21
Machinery, vehicles and equipment1,492,506 1,414,260 12
Construction in progress88,163 50,426 —
Less: accumulated depreciation and depletion1,174,195 1,097,387 
Net property, plant and equipment$1,315,213 $1,250,310 
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*Depleted on the units-of-production method based on proven and probable aggregate reserves.
Total depreciation and depletion expense was $113.6 million, $93.9 million and $82.3 million for the years ended December 31, 2022, 2021 and 2020, respectively.