FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 GSTA	Aug. 01, 2012 GSTA	Dec. 31, 2012 Recurring Amount	Dec. 31, 2011 Recurring Amount	Dec. 31, 2011 Recurring Other Observable Inputs (Level 2)	Dec. 31, 2012 Recurring Significant Unobservable Inputs (Level 3)
Fair value measurements
Period over which monthly payment of agreed upon percentage of acquisition and renewal revenue is required to be paid	5 years
Period over which the projected amount would have been received by the marketing partner if the prior marketing agreement was extended	5 years
Contingent consideration		$ (3,000)	$ (2,693)			$ (2,693)
Interest Rate Swap Contracts				$ (3,871)	$ (3,871)