RESTRUCTURING, INTEGRATION AND OTHER COSTS (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012 employee	Dec. 31, 2011	Dec. 31, 2010
Restructuring reserve
Balance at the beginning of the period	$ 13,153,000	$ 26,459,000
Costs incurred and charged to expense	13,920,000	46,941,000	134,821,000
Cash payments	(25,860,000)	(55,582,000)	(56,443,000)
Non-cash adjustments	139,000	(4,665,000)	(51,919,000)
Balance at the end of the period	1,352,000	13,153,000	26,459,000
Approximate number of employees expected to be terminated	500
Employee Termination Costs - Severance and Related Benefits
Restructuring reserve
Balance at the beginning of the period	2,158,000	24,789,000
Costs incurred and charged to expense	1,586,000	14,548,000	58,727,000
Cash payments	(3,288,000)	(38,168,000)	(33,938,000)
Non-cash adjustments	442,000	989,000
Balance at the end of the period	898,000	2,158,000	24,789,000
Employee Termination Costs - Share-Based Compensation
Restructuring reserve
Balance at the beginning of the period	681,000
Costs incurred and charged to expense		3,455,000	49,482,000
Cash payments		(2,033,000)
Non-cash adjustments	(681,000)	(741,000)	(49,482,000)
Balance at the end of the period		681,000
IPR&D Termination Costs
Restructuring reserve
Costs incurred and charged to expense			13,750,000
Cash payments			(13,750,000)
Contract Termination, Facility Closure and Other Costs
Payments for Restructuring	41,400,000
Restructuring reserve
Balance at the beginning of the period	10,314,000	1,670,000
Costs incurred and charged to expense	12,334,000	28,938,000	12,862,000
Cash payments	(22,572,000)	(15,381,000)	(8,755,000)
Non-cash adjustments	378,000	(4,913,000)	(2,437,000)
Balance at the end of the period	$ 454,000	$ 10,314,000	$ 1,670,000