EMPLOYEE BENEFIT PLANS - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions |
3 Months Ended |
|
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Feb. 28, 2018 |
Mar. 01, 2017 |
| Weighted Average Remaining Life |
|
|
|
|
| Weighted average estimated fair value of awards granted (in dollars per share) |
$ 8.83
|
$ 8.52
|
|
|
| Assumptions used to calculate fair value of awards granted to top eleven employees |
|
|
|
|
| Expected volatility |
46.00%
|
49.00%
|
|
|
| Expected dividend yield |
0.00%
|
0.00%
|
|
|
| Expected life |
6 years 2 months 5 days
|
6 years 2 months 12 days
|
|
|
| Expected forfeiture rate |
0.00%
|
0.00%
|
|
|
| Risk-free interest rate |
2.72%
|
2.15%
|
|
|
| Stock Options |
|
|
|
|
| Options |
|
|
|
|
| Outstanding at the beginning of the period (in shares) |
2,564,822
|
|
|
|
| Granted (in shares) |
604,012
|
|
|
|
| Exercised (in shares) |
(443,204)
|
(5,525)
|
|
|
| Forfeited/Expired (in shares) |
(298,831)
|
|
|
|
| Outstanding at the end of the period (in shares) |
2,426,799
|
|
|
|
| Vested and expected to vest at the end of the period (in shares) |
2,426,799
|
|
|
|
| Exercisable at the end of the period (in shares) |
535,906
|
|
|
|
| Weighted Average Exercise Price Per Share |
|
|
|
|
| Outstanding at the beginning of the period (in dollars per share) |
$ 20.35
|
|
|
|
| Granted (in dollars per share) |
20.60
|
|
|
|
| Exercised (in dollars per share) |
18.86
|
|
|
|
| Forfeited/Expired (in dollars per share) |
36.29
|
|
|
|
| Outstanding at the end of the period (in dollars per share) |
18.72
|
|
|
|
| Vested and expected to vest at the end of the period (in dollars per share) |
18.72
|
|
|
|
| Exercisable at the end of the period (in dollars per share) |
$ 17.92
|
|
|
|
| Aggregate Intrinsic Value |
|
|
|
|
| Outstanding at the end of the period |
$ 13
|
|
|
|
| Vested and expected to vest at the end of the period |
13
|
|
|
|
| Exercisable at the end of the period |
$ 3
|
|
|
|
| Weighted Average Remaining Life |
|
|
|
|
| Outstanding at the end of the period |
7 years 21 days
|
|
|
|
| Vested and expected to vest at the end of the period |
7 years 21 days
|
|
|
|
| Exercisable at the end of the period |
2 years 9 months 20 days
|
|
|
|
| Aggregate Intrinsic value of awards exercised (less than $1 million - 2017) |
$ 1
|
$ 1
|
|
|
| Unrecognized compensation costs |
$ 9
|
|
|
|
| Period for recognition of unrecognized compensation costs |
2 years 3 months 9 days
|
|
|
|
| Stock Options | 2008 Stock Incentive Plan | Senior Officers |
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|
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|
| Options |
|
|
|
|
| Granted (in shares) |
604,012
|
987,781
|
|
|
| Weighted Average Remaining Life |
|
|
|
|
| Target closing stock price (in dollars per share) |
$ 25.75
|
$ 23.74
|
|
|
| Stock price premium |
25.00%
|
25.00%
|
|
|
| Share price (in dollars per share) |
|
|
$ 20.60
|
$ 18.99
|
| Number of consecutive trading days (at least) |
20 days
|
20 days
|
|
|
| Vesting date of grant anniversary subject to specific conditions |
3 years
|
|
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|