| Summary of activity related to stock option awards and restricted stock awards |
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Shares Subject to Stock Option Awards
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Nine Months Ended September 30,
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2018
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2017
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Avg wtd
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Avg wtd
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Avg wtd
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Avg wtd
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grant-date
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exercise
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grant-date
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exercise
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fair value
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price
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Units
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fair value
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price
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Units
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Outstanding at beginning of period
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$
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3.66
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$
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5.71
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9,078,728
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$
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3.40
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$
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4.90
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8,669,475
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Granted
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6.51
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14.25
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359,618
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6.14
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13.51
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774,357
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Forfeited
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6.28
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13.77
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(8,520)
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2.89
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3.44
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(122,461)
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Exercised
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2.81
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3.06
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(222,453)
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2.44
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2.54
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(73,406)
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Modified to liability to be cash settled
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—
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—
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—
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2.58
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2.54
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(156,272)
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Outstanding at end of the period
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$
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3.79
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$
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6.11
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9,207,373
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$
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3.66
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$
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5.71
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9,091,693
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Vested
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$
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3.34
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$
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4.74
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6,447,462
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$
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3.13
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$
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4.13
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5,397,026
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Unvested
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4.84
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9.31
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2,759,911
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4.42
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8.03
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3,694,667
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Restricted Stock Awards
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Nine Months Ended September 30,
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2018
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2017
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Avg wtd grant-
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Avg wtd grant-
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date fair value
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Units
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date fair value
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Units
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Unvested at beginning of period
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$
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11.82
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1,293,107
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$
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9.48
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1,018,228
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Granted
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13.81
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1,904,595
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13.51
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623,165
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Vested
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10.48
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(209,765)
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7.99
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(339,701)
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Forfeited
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—
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—
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8.81
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(8,585)
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Unvested at end of period
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$
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13.18
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2,987,937
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$
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11.82
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1,293,107
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Director Plan Restricted Stock Awards
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Nine Months Ended September 30,
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2018
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2017
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Avg wtd grant-
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Avg wtd grant-
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date fair value
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Units
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date fair value
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Units
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Unvested at beginning of period
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$
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—
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—
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$
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5.71
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49,230
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Granted
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—
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—
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—
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—
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Vested
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—
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—
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5.71
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(49,230)
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Forfeited
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—
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—
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—
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—
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Unvested at end of period
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$
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—
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—
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$
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—
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—
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