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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 |

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- Definition Cumulative EBITDA Required for Award Shares to Vest + References No definition available. + Details
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- Definition Number of Consecutive Quarters to Mantain Cumulative EBITDA Required for Award Shares to Vest + References No definition available. + Details
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- 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 No definition available. + Details
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- Definition 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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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