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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Stock-Based Compensation) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-Based Compensation Expense [Abstract]      
Compensation expense $ 39,030 $ 36,349 $ 34,537
Performance service period 3 years    
Net cash proceeds from the exercise of stock options and ESPP $ 9,888 5,861 7,404
Excess tax benefit from stock-based compensation   4,698 8,528
Cost of revenues      
Stock-Based Compensation Expense [Abstract]      
Compensation expense 4,971 5,495 5,815
Selling and marketing      
Stock-Based Compensation Expense [Abstract]      
Compensation expense 7,086 6,634 5,114
Software development      
Stock-Based Compensation Expense [Abstract]      
Compensation expense 7,071 6,546 5,712
General and administrative      
Stock-Based Compensation Expense [Abstract]      
Compensation expense 19,902 17,674 17,896
Restricted Stock Awards — with Market Condition      
Stock-Based Compensation Expense [Abstract]      
Compensation expense 5,000 $ 3,000 $ 3,000
Compensation cost expected to be recognized in future years $ 6,000