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STOCK-BASED COMPENSATION (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Stock-based compensation |  |  |
Stock-based compensation plans | 2 |  |
Compensation expense on share-based plans | $ 7,000,000 | $ 7,000,000 |
Stock options |  |  |
Stock-based compensation |  |  |
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | 2,600,000 | 200,000 |
Weighted-average assumptions used to estimate the fair value of options granted |  |  |
Dividend yield (as a percent) | 0.00% | 0.00% |
Expected volatility (as a percent) | 43.10% | 47.80% |
Risk-free interest rate (as a percent) | 1.60% | 0.90% |
Expected term | 5 years 10 months 24 days | 5 years 4 months 24 days |
Stock Options, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 12,973 |  |
Granted (in shares) | 689 |  |
Exercised (in shares) | (235) |  |
Cancelled or forfeited (in shares) | (16) |  |
Balance at the end of the period (in shares) | 13,411 |  | 12,973
Vested and expected to vest in the future at the end of the period (in shares) | 12,905 |  |
Exercisable at the end of the period (in shares) | 10,323 |  |
Stock options, Weighted-Average Exercise Price Per Share |  |  |
Balance at the beginning of the period (in dollars per share) | $ 15.70 |  |
Granted (in dollars per share) | $ 70.06 |  |
Exercised (in dollars per share) | $ 24.33 |  |
Cancelled or forfeited (in dollars per share) | $ 47.09 |  |
Balance at the end of the period (in dollars per share) | $ 18.30 |  | $ 15.70
Vested and expected to vest in the future at the end of the period (in dollars per share) | $ 16.92 |  |
Exercisable at the end of the period (in dollars per share) | $ 9.45 |  |
Weighted-Average Remaining Contractual Term |  |  |
Balance at the beginning of the period | 3 years 9 months 18 days |  | 3 years 8 months 12 days
Balance at the end of the period | 3 years 9 months 18 days |  | 3 years 8 months 12 days
Vested and expected to vest in the future at the end of the period | 3 years 7 months 6 days |  |
Exercisable at the end of the period | 2 years 4 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Balance at the beginning of the period | 675,595,000 |  |
Balance at the end of the period | 686,398,000 |  | 675,595,000
Vested and expected to vest in the future at the end of the period | 678,326,000 |  |
Exercisable at the end of the period | $ 619,368,000 |  |

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