EMPLOYEE BENEFIT PLANS (Tables)
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3 Months Ended |
Mar. 31, 2018 |
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| Defined Benefit Plan [Abstract] |
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| Summary of stock option activity |
The following table summarizes stock option activity during the three months ended March 31, 2018: | | | | | | | | | | | | | | | | | Options | | Weighted Average
Exercise Price
Per Share | | Aggregate
Intrinsic Value | | Weighted Average
Remaining Life | | | | | | | (In Millions) | | | Outstanding at December 31, 2017 | | 2,564,822 |
| | $ | 20.35 |
| | | | | Granted | | 604,012 |
| | 20.60 |
| | | | | Exercised | | (443,204 | ) | | 18.86 |
| | | | | Forfeited/Expired | | (298,831 | ) | | 36.29 |
| | | | | Outstanding at March 31, 2018 | | 2,426,799 |
| | $ | 18.72 |
| | $ | 13 |
| | 7.1 years | Vested and expected to vest at March 31, 2018 | | 2,426,799 |
| | $ | 18.72 |
| | $ | 13 |
| | 7.1 years | Exercisable at March 31, 2018 | | 535,906 |
| | $ | 17.92 |
| | $ | 3 |
| | 2.8 years |
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| Schedule of assumptions used to determine fair value of stock options |
These fair values were calculated based on each grant date, using a Monte Carlo simulation with the following assumptions: | | | | | | | | Three Months Ended March 31, | | | 2018 | | 2017 | Expected volatility | | 46% | | 49% | Expected dividend yield | | 0% | | 0% | Expected life | | 6.2 years | | 6.2 years | Expected forfeiture rate | | 0% | | 0% | Risk-free interest rate | | 2.72% | | 2.15% |
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| Summary of information about stock options by range of exercise prices |
The following table summarizes information about our outstanding stock options at March 31, 2018: | | | | | | | | | | | | | | | | | | | | Options Outstanding | | Options Exercisable | Range of Exercise Prices | | Number of
Options | | Weighted Average
Remaining
Contractual Life | | Weighted Average
Exercise Price | | Number of
Options | | Weighted Average
Exercise Price | $0.00 to $4.569 | | 124,332 |
| | 0.9 years | | $ | 4.56 |
| | 124,332 |
| | $ | 4.56 |
| $4.57 to $19.759 | | 1,292,315 |
| | 7.5 years | | 18.18 |
| | 5,434 |
| | 18.99 |
| $19.76 to $25.080 | | 1,010,152 |
| | 7.3 years | | 21.16 |
| | 406,140 |
| | 22.00 |
| | | 2,426,799 |
| | 7.1 years | | $ | 18.72 |
| | 535,906 |
| | $ | 17.92 |
|
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| Summary of restricted stock unit activity |
The following table summarizes restricted stock unit activity during the three months ended March 31, 2018: | | | | | | | | | | | Restricted Stock
Units | | Weighted Average Grant
Date Fair Value Per Unit | Unvested at December 31, 2017 | | 2,253,988 |
| | $ | 35.20 |
| Granted | | 578,831 |
| | 22.43 |
| Vested | | (689,648 | ) | | 35.62 |
| Forfeited | | (80,543 | ) | | 42.01 |
| Unvested at March 31, 2018 | | 2,062,628 |
| | $ | 31.21 |
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