INTEREST AND OTHER, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Interest and other, net
Interest income (expense), net									$ (30,763)	$ (20,616)	$ (15,248)
Gain (loss) on sale										2,200	(106)
Foreign currency exchange gain (loss)									(778)	(1,311)	1,414
Other									190	156	421
Interest and other, net	(7,789)	(8,094)	(7,419)	(8,049)	(5,368)	(6,190)	(4,333)	(3,680)	(31,351)	(19,571)	(13,519)
Cash received from sale of intellectual property										2,200
Gain on sale of intellectual property										$ 2,200