PROPERTY, PLANT, AND EQUIPMENT - Schedule of Estimated Useful Lives (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, plant and equipment
Property, plant and equipment, at cost	$ 573,665		$ 532,956
Accumulated depreciation	(110,228)		(77,631)
Property, plant and equipment, net	463,437		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	111,778		80,352
Land improvements
Property, plant and equipment
Estimated Useful Life		15 years
Property, plant and equipment, at cost	2,399		1,766
Buildings
Property, plant and equipment
Property, plant and equipment, at cost	165,926		112,815
Computer equipment and computer software
Property, plant and equipment
Estimated Useful Life		3 years
Property, plant and equipment, at cost	74,447		65,323
Laboratory equipment
Property, plant and equipment
Property, plant and equipment, at cost	130,323		104,008
Furniture and fixtures
Property, plant and equipment
Property, plant and equipment, at cost	22,698		14,539
Assets under construction
Property, plant and equipment
Property, plant and equipment, at cost	$ 61,628		$ 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