EARNINGS PER SHARE AND STOCK-BASED COMPENSATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Non-cash compensation expense related to equity awards
Non-cash compensation expense	$ 1,072	$ 788	$ 2,256	$ 1,908
Cost of revenue
Non-cash compensation expense related to equity awards
Non-cash compensation expense	1	1	4	3
Selling and marketing expense
Non-cash compensation expense related to equity awards
Non-cash compensation expense	202	105	359	265
General and administrative expense
Non-cash compensation expense related to equity awards
Non-cash compensation expense	761	624	1,636	1,485
Product development
Non-cash compensation expense related to equity awards
Non-cash compensation expense	$ 108	$ 58	$ 257	$ 155