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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
The carrying value and estimated useful lives of property, plant and equipment are as follows:
(In thousands)Estimated Useful LifeSeptember 30, 2024December 31, 2023
Property, plant and equipment
Landn/a$4,716 $4,716 
Leasehold and building improvements(1)227,600 214,562 
Land improvements15 years6,747 6,729 
Buildings
30 - 40 years
290,777 290,777 
Computer equipment and computer software3 years199,715 168,131 
Machinery and equipment
3 - 10 years
324,129 290,294 
Furniture and fixtures
3 - 10 years
36,976 35,756 
Assets under constructionn/a80,063 104,592 
Property, plant and equipment, at cost1,170,723 1,115,557 
Accumulated depreciation(480,391)(417,203)
Property, plant and equipment, net$690,332 $698,354 
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(1)Lesser of remaining lease term, building life, or estimated useful life.
Depreciation expense for the three months ended September 30, 2024 and 2023 was $30.3 million and $29.3 million, respectively. Depreciation expense for the nine months ended September 30, 2024 and 2023 was $90.7 million and $83.6 million, respectively.
At September 30, 2024, the Company had $80.1 million of assets under construction, which consisted of $52.3 million in machinery and equipment, $12.7 million in capitalized costs related to software projects, $10.0 million in leasehold and building improvements, $5.1 million related to buildings, and minimal furniture and fixtures. Depreciation will begin on these assets once they are placed into service upon completion.