SEGMENT AND GEOGRAPHIC INFORMATION (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 item	Mar. 31, 2012	Mar. 31, 2011
SEGMENT AND GEOGRAPHIC INFORMATION
Number of reportable segments									1
Net revenue by geographic region:
Total net revenue	$ 299,487	$ 415,773	$ 273,084	$ 226,139	$ 148,084	$ 236,325	$ 107,034	$ 334,380	$ 1,214,483	$ 825,823	$ 1,136,876
United States
Net revenue by geographic region:
Total net revenue									710,488	449,189	619,731
Europe
Net revenue by geographic region:
Total net revenue									328,003	246,260	364,017
Canada and Latin America
Net revenue by geographic region:
Total net revenue									88,427	61,773	71,476
Asia Pacific
Net revenue by geographic region:
Total net revenue									$ 87,565	$ 68,601	$ 81,652