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STOCK-BASED COMPENSATION (Details 2) - Stock options - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Weighted-average assumptions used to estimate the fair value of options granted |  |  |  |  |  |  |
Dividend yield (as a percent) | 0.00% |  |  |  | 0.00% | 0.00% |
Expected volatility (as a percent) | 36.70% |  |  |  | 37.10% | 42.40% |
Risk-free interest rate (as a percent) | 1.50% |  |  |  | 1.60% | 1.60% |
Expected term | 6 years 1 month 6 days |  |  |  | 5 years 9 months 18 days | 5 years 9 months 18 days |
Stock Options, Number of Shares |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 13,066,000 |  | 13,066,000 |  |
Granted (in shares) | 56,000 | 33,000 | 903,000 | 0 |  |  |
Exercised (in shares) |  |  |  |  | (7,153,000) |  |
Cancelled or forfeited (in shares) |  |  |  |  | (73,000) |  |
Balance at the end of the period (in shares) | 6,832,000 |  |  |  | 6,832,000 |  | 13,066,000
Vested and expected to vest in the future at the end of the period (in shares) | 6,428,000 |  |  |  | 6,428,000 |  |
Exercisable at the end of the period (in shares) | 4,005,000 |  |  |  | 4,005,000 |  |
Stock options, Weighted-Average Exercise Price Per Share |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  | $ 19.73 |  | $ 19.73 |  |
Granted (in dollars per share) | $ 135.00 | $ 133.43 | $ 133.68 |  |  |  |
Exercised (in dollars per share) |  |  |  |  | 6.11 |  |
Cancelled or forfeited (in dollars per share) |  |  |  |  | 64.62 |  |
Balance at the end of the period (in dollars per share) | 50.05 |  |  |  | 50.05 |  | $ 19.73
Vested and expected to vest in the future at the end of the period (in dollars per share) | 47.00 |  |  |  | 47.00 |  |
Exercisable at the end of the period (in dollars per share) | $ 23.74 |  |  |  | $ 23.74 |  |
Weighted-Average Remaining Contractual Term |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 5 years 9 months 18 days |  | 3 years 1 month 6 days
Balance at the end of the period |  |  |  |  | 5 years 9 months 18 days |  | 3 years 1 month 6 days
Vested and expected to vest in the future at the end of the period |  |  |  |  | 5 years 7 months 6 days |  |
Exercisable at the end of the period |  |  |  |  | 4 years |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 1,158,412 |  | $ 1,158,412 |  |
Balance at the end of the period | $ 581,663 |  |  |  | 581,663 |  | $ 1,158,412
Vested and expected to vest in the future at the end of the period | 566,879 |  |  |  | 566,879 |  |
Exercisable at the end of the period | $ 446,159 |  |  |  | $ 446,159 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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