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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, plant and equipment
Depreciation	$ 22,300	$ 19,700	$ 64,300	$ 53,300
Property, plant and equipment, at cost	719,487		719,487		$ 589,524
Assets under construction
Property, plant and equipment
Property, plant and equipment, at cost	64,187		64,187		18,854
Laboratory equipment
Property, plant and equipment
Property, plant and equipment, at cost	175,393		175,393		142,110
Assets under construction	11,800		11,800
Leasehold and building improvements
Property, plant and equipment
Property, plant and equipment, at cost	142,025		142,025		117,865
Assets under construction	40,600		40,600
Computer software
Property, plant and equipment
Assets under construction	11,600		11,600
Land improvements
Property, plant and equipment
Property, plant and equipment, at cost	4,894		4,894		$ 4,864
Assets under construction	$ 200		$ 200

X

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-Paragraph 28
-Subparagraph (b)
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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