NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Goodwill
Goodwill	$ 404,211,000	$ 402,736,000	$ 294,789,000
Goodwill recognized	404,200,000
Revenue
Number of components of monthly fees	2
Rental income as a percentage of total revenue, maximum	10.00%	10.00%	10.00%
Depreciation and Software and Leasehold Amortization
Depreciation and software and leasehold amortization	27,399,000	23,081,000	20,391,000
Costs related to services	12,800,000	10,200,000	10,800,000
Capitalized Interest
Interest costs capitalized	200,000
Foreign Currency Translation
Cumulative translation adjustments included in accumulated other comprehensive loss	$ 1,400,000	$ 2,000,000	$ 2,000,000
Minimum
Intangible Assets
Useful lives of intangible assets	5 years
Maximum
Intangible Assets
Useful lives of intangible assets	10 years