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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, STOCK BASED COMPENSATION EXPENSE (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock-Based Compensation Expense [Abstract]        
Compensation expense $ 7,788,000 $ 3,739,000 $ 32,270,000 $ 8,667,000
Net cash proceeds from the exercise of stock options and ESPP 6,935,000 2,635,000 15,846,000 7,667,000
Excess tax benefits realized from stock option exercised and restricted stock awards vested 5,655,000 (57,000) 15,405,000 (57,000)
Exercise of stock options (in shares) 150,560 76,542 340,599 224,382
Cost of Revenues [Member]
        
Stock-Based Compensation Expense [Abstract]        
Compensation expense 1,061,000 849,000 3,353,000 1,784,000
Selling and Marketing [Member]
        
Stock-Based Compensation Expense [Abstract]        
Compensation expense 944,000 493,000 3,763,000 1,331,000
Software Development [Member]
        
Stock-Based Compensation Expense [Abstract]        
Compensation expense 1,608,000 809,000 5,439,000 1,565,000
General and Administrative [Member]
        
Stock-Based Compensation Expense [Abstract]        
Compensation expense 4,175,000 1,588,000 19,715,000 3,987,000
Performance-Based Restricted Common Stock [Member]
        
Stock-Based Compensation Expense [Abstract]        
Cumulative EBITDA required for award shares to vest 90,000,000   90,000,000  
Number of consecutive quarters to mantain cumulative EBITDA required for award shares to vest 4   4  
Compensation expense 3,100,000 0 17,500,000 0
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized $ 6,200,000   $ 6,200,000