STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 5,499	$ 4,715	$ 15,076	$ 14,065
Related income tax benefits	(2,355)	(1,941)	(6,101)	(5,949)
Stock-based compensation, net of tax benefits	3,144	2,774	8,975	8,116
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1,430	1,254	3,962	3,801
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2,646	2,335	7,036	6,893
Technology [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,423	$ 1,126	$ 4,078	$ 3,371