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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, STOCK BASED COMPENSATION EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stock-Based Compensation Expense [Abstract]
Net cash proceeds from the exercise of stock options and Employee Stock Purchase Plan	$ 1,000	$ 646	$ 4,791	$ 5,350
Excess tax benefits realized from stock option exercised and restricted stock awards vested	398	418	5,000	8,000
Compensation expense	$ 9,311	$ 9,312	$ 26,981	$ 25,169
Exercise of stock options (in shares)	3,367	0	24,078	41,068
Cost of Revenues [Member]
Stock-Based Compensation Expense [Abstract]
Compensation expense	$ 1,396	$ 1,533	$ 4,209	$ 4,242
Selling and Marketing [Member]
Stock-Based Compensation Expense [Abstract]
Compensation expense	1,676	1,411	4,920	3,595
Software Development [Member]
Stock-Based Compensation Expense [Abstract]
Compensation expense	1,684	1,602	4,902	4,318
General and Administrative [Member]
Stock-Based Compensation Expense [Abstract]
Compensation expense	$ 4,555	$ 4,766	$ 12,950	$ 13,014

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock options and participants of employee stock purchase plans. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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