STOCK BASED COMPENSATION - Stock Option Plan Activity (Details) - Stock Option Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
12 Months Ended |
|
|
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Number of Options |
|
|
|
|
|
|
| Beginning balance (in shares) |
935
|
969
|
694
|
935
|
969
|
694
|
| Options granted (in shares) |
107
|
299
|
|
|
|
|
| Options exercised (in shares) |
(116)
|
0
|
|
|
|
|
| Options forfeited (in shares) |
(25)
|
(24)
|
|
|
|
|
| Ending balance (in shares) |
935
|
969
|
694
|
|
|
|
| Options vested and exercisable, December 31, 2016 (in shares) |
|
|
|
525
|
|
|
| Weighted Average Exercise Price |
|
|
|
|
|
|
| Beginning balance (in dollars per share) |
$ 18.21
|
$ 17.45
|
$ 15.60
|
$ 18.21
|
$ 17.45
|
$ 15.60
|
| Options granted (in dollars per share) |
22.83
|
22.09
|
|
|
|
|
| Options exercised (in dollars per share) |
15.42
|
|
|
|
|
|
| Options forfeited (in dollars per share) |
21.56
|
22.00
|
|
|
|
|
| Ending balance (in dollars per share) |
$ 18.21
|
$ 17.45
|
$ 15.60
|
|
|
|
| Options vested and exercisable, December 31, 2016 (in dollars per share) |
|
|
|
$ 15.45
|
|
|
| Weighted Average Remaining Contractual Term, Options outstanding |
6 years 2 months 23 days
|
6 years 7 months 13 days
|
6 years 6 months 25 days
|
|
|
|
| Weighted Average Remaining Contractual Term, Options vested and exercisable |
4 years 7 months 29 days
|
|
|
|
|
|
| Aggregate Intrinsic Value, Options outstanding |
|
|
|
$ 16,773
|
$ 6,006
|
$ 4,437
|
| Aggregate Intrinsic Value, Options vested and exercisable |
|
|
|
$ 10,863
|
|
|