SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Stock-Based Compensation) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) quarters	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Stock-Based Compensation Expense [Abstract]
Compensation expense	$ 34,537	$ 28,267	$ 41,549
Performance service period	3 years
Net cash proceeds from the exercise of stock options and ESPP	$ 7,404	5,740	18,133
Excess tax benefit from stock-based compensation	8,528	28,406	19,585
Cost of revenues
Stock-Based Compensation Expense [Abstract]
Compensation expense	5,815	4,759	4,553
Selling and marketing
Stock-Based Compensation Expense [Abstract]
Compensation expense	5,114	3,776	4,954
Software development
Stock-Based Compensation Expense [Abstract]
Compensation expense	5,712	5,095	7,244
General and administrative
Stock-Based Compensation Expense [Abstract]
Compensation expense	17,896	14,637	24,798
Performance-Based Restricted Common Stock [Member]
Stock-Based Compensation Expense [Abstract]
Cumulative EBITDA required for award shares to vest	$ 90,000
Number of consecutive quarters to mantain cumulative EBITDA required for award shares to vest (in quarters) | quarters	4
Compensation expense	$ 0	2,200	$ 21,800
Performance-based RSAs - with Market Condition [Member]
Stock-Based Compensation Expense [Abstract]
Compensation expense	2,800	$ 1,100
Compensation cost expected to be recognized in future years	$ 5,300