STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 4,828	$ 4,833	$ 9,577	$ 9,350
Related income tax benefits	(1,804)	(1,920)	(3,746)	(4,008)
Stock-based compensation, net of tax benefits	3,024	2,913	5,831	5,342
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1,371	1,389	2,532	2,547
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1,987	2,304	4,390	4,558
Technology [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,470	$ 1,140	$ 2,655	$ 2,245