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SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended						6 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Revenue and long-lived assets by geography
Revenue	$ 680,612	$ 640,600	$ 596,943	$ 516,884	$ 485,404	$ 460,213	$ 1,321,212	$ 945,617	$ 2,059,444	$ 1,636,815
Long-lived assets (excluding goodwill and intangible assets)	255,926		259,588				255,926		259,588
United States
Revenue and long-lived assets by geography
Revenue	472,553				384,835		918,213	757,497
Long-lived assets (excluding goodwill and intangible assets)	241,747		246,550				241,747		246,550
All other countries
Revenue and long-lived assets by geography
Revenue	208,059				100,569		402,999	188,120
Long-lived assets (excluding goodwill and intangible assets)	$ 14,179		$ 13,038				$ 14,179		$ 13,038

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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