PROPERTY, PLANT, AND EQUIPMENT - Schedule of Estimated Useful Lives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property, plant and equipment
Property, plant and equipment, at cost	$ 586,216		$ 532,956
Accumulated depreciation	(129,761)		(77,631)
Property, plant and equipment, net	456,455		455,325
Land
Property, plant and equipment
Property, plant and equipment, at cost	4,466		4,466
Leasehold and building improvements
Property, plant and equipment
Property, plant and equipment, at cost	113,153		80,352
Land improvements
Property, plant and equipment
Estimated Useful Life		15 years
Property, plant and equipment, at cost	3,222		1,766
Buildings
Property, plant and equipment
Property, plant and equipment, at cost	200,141		112,815
Computer equipment and computer software
Property, plant and equipment
Estimated Useful Life		3 years
Property, plant and equipment, at cost	78,350		65,323
Laboratory equipment
Property, plant and equipment
Property, plant and equipment, at cost	136,462		104,008
Furniture and fixtures
Property, plant and equipment
Property, plant and equipment, at cost	23,950		14,539
Assets under construction
Property, plant and equipment
Property, plant and equipment, at cost	$ 26,472		$ 149,687
Minimum | Buildings
Property, plant and equipment
Estimated Useful Life	30 years
Minimum | Laboratory equipment
Property, plant and equipment
Estimated Useful Life		3 years
Minimum | Furniture and fixtures
Property, plant and equipment
Estimated Useful Life		3 years
Maximum | Buildings
Property, plant and equipment
Estimated Useful Life	40 years
Maximum | Laboratory equipment
Property, plant and equipment
Estimated Useful Life		10 years
Maximum | Furniture and fixtures
Property, plant and equipment
Estimated Useful Life		10 years