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STOCK-BASED COMPENSATION (Details 2) (Stock Options, USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Summary of stock option activity |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  | 677,708 |  |  |
Exercised (in shares) |  |  |  | (45,851) |  |  |
Expired (in shares) |  |  |  | (161,324) |  |  |
Outstanding at end of period (in shares) | 470,533 |  |  | 470,533 |  |  |
Vested or expected to vest at end of period (in shares) | 470,533 |  |  | 470,533 |  |  |
Exercisable at end of period (in shares) | 470,533 |  |  | 470,533 |  |  |
Outstanding at beginning of period, weighted average exercise price (in dollars per share) |  |  |  | $ 28.41 |  |  |
Exercised, weighted average exercise price (in dollars per share) |  |  |  | $ 15.63 |  |  |
Expired, weighted average exercise price (in dollars per share) |  |  |  | $ 37.18 |  |  |
Outstanding at end of period, weighted average exercise price (in dollars per share) | $ 26.65 |  |  | $ 26.65 |  |  |
Vested or expected to vest at end of period, weighted average exercise price (in dollars per share) | $ 26.65 |  |  | $ 26.65 |  |  |
Exercisable at end of period, weighted average exercise price (in dollars per share) | $ 26.65 |  |  | $ 26.65 |  |  |
Outstanding at end of period, weighted average remaining term |  |  |  | 1 year 3 months 29 days |  |  |
Vested or expected to vest at end of period, weighted average remaining term |  |  |  | 1 year 3 months 29 days |  |  |
Exercisable at end of period, weighted average remaining term |  |  |  | 1 year 3 months 29 days |  |  |
Outstanding at end of period, aggregate intrinsic value | $ 2,078 |  |  | $ 2,078 |  |  |
Vested or expected to vest at end of period, aggregate intrinsic value | 2,078 |  |  | 2,078 |  |  |
Exercisable at end of period, aggregate intrinsic value | 2,078 |  |  | 2,078 |  |  |
Summary of unvested stock option activity |  |  |  |  |  |  |
Unvested options at beginning of period (in shares) |  |  |  | 14,502 |  |  |
Vested (in shares) |  |  |  | (14,502) |  |  |
Unvested options at beginning of period, weighted average grant date fair value (in dollars per share) |  |  |  | $ 3.00 |  |  |
Vested, weighted average grant date fair value (in dollars per share) |  |  |  | $ 3.00 |  |  |
Share based compensation plan, additional disclosures |  |  |  |  |  |  |
Total intrinsic value of options exercised | 297 | 280 |  | 424 |  | 855 |
Total fair value of options vested |  | $ 671 | [1] | $ 363 | [1] | $ 3,672 | [1]
Minimum |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Contractual term of stock option grants |  |  |  | 7 years |  |  |
Maximum |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |
Contractual term of stock option grants |  |  |  | 10 years |  |  |
[1] | Stock options were fully vested during the first quarter of 2013.

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