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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2013
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted |
|  | Three-Months Ended June 30, |  | Six-Months Ended June 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Dividend yield |  | 0.0 % |  | 0.0 % |  | 0.0 % |  | 0.0 %
Expected volatility |  | 48.1 % |  | 47.6 % |  | 47.9 % |  | 48.1 %
Risk-free interest rate |  | 1.0 % |  | 0.9 % |  | 0.9 % |  | 0.9 %
Expected term |  | 6.1 Years |  | 5.4 Years |  | 5.7 Years |  | 5.5 Years
Summary of activities with respect to its stock option plans |
Options |  | Number of Shares (In Thousands) |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2013 |  | 14,000 |  | $ | 12.12 |  | 4.1 |  | $ | 572,530
Granted 01/01/13 - 03/31/13 |  | 636 |  | $ | 47.36 |  |  |  |
Granted 04/01/13 - 06/30/13 |  | 450 |  | $ | 54.00 |  |  |  |
Exercised |  | (1,818) |  | $ | 8.96 |  |  |  |
Cancelled or forfeited |  | (155) |  | $ | 27.10 |  |  |  |
Outstanding at June 30, 2013 |  | 13,113 |  | $ | 15.53 |  | 4.2 |  | $ | 594,437
Vested and expected to vest in the future at June 30, 2013 |  | 12,698 |  | $ | 14.63 |  | 4.1 |  | $ | 586,995
Exercisable at June 30, 2013 |  | 10,039 |  | $ | 9.04 |  | 3.0 |  | $ | 519,980
Summary of activities with respect to non-vested restricted stock awards and non-vested restricted stock units |
|  | Number of Shares (in thousands) |  | Weighted Average Grant-Date Fair Value
Non-vested at January 1, 2013 |  | 637 |  | $ | 46.97
Granted 01/01/13 - 03/31/13 |  | 8 |  | $ | 50.89
Granted 04/01/13 - 06/30/13 |  | 15 |  | $ | 54.64
Vested |  | (46) |  | $ | 51.96
Forfeited/cancelled |  | (6) |  | $ | 60.11
Non-vested at June 30, 2013 |  | 608 |  | $ | 46.69

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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