PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

The estimated useful lives of property, plant and equipment are as follows:

		December 31,
(In thousands)	Estimated Useful Life	2020		2019
Property, plant and equipment
Land	n/a	$	4,466	$	4,466
Leasehold and building improvements	(1)	117,865		80,352
Land improvements	15 years	4,864		1,766
Buildings	30 - 40 years	200,980		112,815
Computer equipment and computer software	3 years	73,296		65,323
Laboratory equipment	3 - 10 years	142,110		104,008
Furniture and fixtures	3 - 10 years	24,968		14,539
Assets under construction	n/a	18,751		149,687
Property, plant and equipment, at cost		587,300		532,956
Accumulated depreciation		(136,617)		(77,631)
Property, plant and equipment, net		$	450,683	$	455,325

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(1) Lesser of remaining lease term, building life, or estimated useful life.

Depreciation expense for the years ended December 31, 2020, 2019, and 2018 was $69.4 million, $33.9 million, and $20.5 million, respectively.

At December 31, 2020, the Company had $18.8 million of assets under construction which consisted of $3.2 million related to building and leasehold improvements, $7.6 million of costs related to laboratory equipment under construction, $7.9 million of capitalized costs related to software projects, and $0.1 million of furniture and fixtures. Depreciation will begin on these assets once they are placed into service upon completion in 2021 and 2022.