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STOCK-BASED COMPENSATION PLANS (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Activity in the Stock Award and Stock Option Plans | A combined summary of activity in the Company’s stock award and stock option plans for the six months ended June 30, 2019 is presented in the following table:
|  |  | Non-Vested Stock Awards Outstanding |  | Stock Options Outstanding
(Shares in thousands) |  |  | Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Exercise Price
December 31, 2018 |  |  | 371 |  |  | $ | 33.63 |  |  | 31 |  |  | $ | 10.82 |
Granted |  |  | 131 |  |  | 27.91 |  |  | — |  |  | — |
Acquired |  |  | — |  |  | — |  |  | 133 |  |  | 23.99 |
Stock options exercised |  |  | — |  |  | — |  |  | (1 | ) |  | 13.70 |
Stock awards vested |  |  | (127 | ) |  | 31.73 |  |  | — |  |  | — |
Forfeited |  |  | (51 | ) |  | 33.22 |  |  | — |  |  | — |
Expired |  |  | — |  |  | — |  |  | — |  |  | — |
June 30, 2019 |  |  | 324 |  |  | $ | 32.76 |  |  | 163 |  |  | $ | 21.15 |
Exercisable options at June 30, 2019 |  | 163 |  |  | $ | 21.15 |

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