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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 |  |

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- 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) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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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 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 (a) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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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 -Subparagraph (b) -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 + Details
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