PROPERTY AND EQUIPMENT, NET (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Property and equipment, net
Property and equipment, gross	$ 238,859,000		$ 238,859,000		$ 229,994,000
Less: accumulated depreciation	(70,455,000)		(70,455,000)		(63,529,000)
Property and equipment, net	168,404,000		168,404,000		166,465,000
Depreciation expense	3,500,000	3,100,000	6,900,000	6,100,000
Land and buildings
Property and equipment, net
Property and equipment, gross	170,263,000		170,263,000		166,659,000
Laboratory equipment
Property and equipment, net
Property and equipment, gross	39,640,000		39,640,000		35,961,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	3,761,000		3,761,000		3,351,000
Computer hardware and software
Property and equipment, net
Property and equipment, gross	23,079,000		23,079,000		20,903,000
Construction-in-progress
Property and equipment, net
Property and equipment, gross	$ 2,116,000		$ 2,116,000		$ 3,120,000