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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 D	Dec. 31, 2010
Cash and cash equivalents
Maturity period from date of purchase, short-term investments classified as cash equivalents, less than (in days)	91
Property and equipment
Net book value	$ 259,588	$ 267,928
Buildings and leasehold improvements
Property and equipment
Estimated Useful Lives, minimum (in years)	3
Estimated Useful Lives, maximum (in years)	39
Computer equipment and capitalized software
Property and equipment
Estimated Useful Lives, minimum (in years)	2
Estimated Useful Lives, maximum (in years)	3
Capitalized internal use software
Property and equipment
Net book value	$ 29,200	$ 33,900
Furniture and other equipment
Property and equipment
Estimated Useful Lives, minimum (in years)	3
Estimated Useful Lives, maximum (in years)	10

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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