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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of unvested restricted stock awards | The following tables summarize the unvested restricted stock awards at September 30, 2017 and 2016.
|  | Nine Months Ended September 30, |
|  | 2017 |  |  | 2016 |
Perfomance Awards |  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested at beginning |  |  | 33,226 |  |  | $ | 42.60 |  |  |  | — |  |  | $ | — |
Issued |  |  | 36,523 |  |  |  | 57.49 |  |  |  | 34,957 |  |  |  | 42.60 |
Forfeited |  |  | (3,097 | ) |  |  | 42.60 |  |  |  | (1,731 | ) |  |  | 42.60 |
Vested |  |  | (4,314 | ) |  |  | 54.92 |  |  |  | — |  |  |  | — |
Unvested at end |  |  | 62,338 |  |  | $ | 50.45 |  |  |  | 33,226 |  |  | $ | 42.60 |
|  | Nine Months Ended September 30, |
|  | 2017 |  |  | 2016 |
Time Vested Awards |  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested at beginning |  |  | 262,966 |  |  | $ | 33.60 |  |  |  | 369,093 |  |  | $ | 24.43 |
Issued |  |  | 91,097 |  |  |  | 62.70 |  |  |  | 104,775 |  |  |  | 46.39 |
Forfeited |  |  | (1,477 | ) |  |  | 47.69 |  |  |  | (7,815 | ) |  |  | 40.17 |
Vested |  |  | (187,600 | ) |  |  | 30.07 |  |  |  | (195,738 | ) |  |  | 22.53 |
Unvested at end |  |  | 164,986 |  |  | $ | 53.56 |  |  |  | 270,315 |  |  | $ | 33.87
Schedule of activity of stock options | Below is a summary of stock option activity for the nine months ended September 30, 2017 and 2016. The information excludes restricted stock units and awards.
|  | Nine Months Ended September 30, |
|  | 2017 |  |  | 2016 |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |
Beginning balance |  |  | 216,859 |  |  | $ | 8.80 |  |  |  | 298,740 |  |  | $ | 9.97 |
Issued |  |  | — |  |  |  | — |  |  |  | 3,000 |  |  |  | 49.49 |
Exercised |  |  | (64,420 | ) |  |  | 7.46 |  |  |  | (24,458 | ) |  |  | 13.10 |
Forfeited |  |  | — |  |  |  | — |  |  |  | (1,100 | ) |  |  | 15.48 |
Expired |  |  | — |  |  |  | — |  |  |  | (6,637 | ) |  |  | 12.87 |
Ending balance |  |  | 152,439 |  |  | $ | 9.36 |  |  |  | 269,545 |  |  | $ | 10.03 |
Schedule of stock option by exercise price range | The following summarizes information about stock options outstanding at September 30, 2017. The information excludes restricted stock units and awards.
|  |  |  |  |  |  |  |  |  |  |  | Weighted-Average |
Outstanding: |  |  | Stock Options |  |  | Weighted-Average |  |  | Remaining |
Range of Exercise Prices |  |  | Outstanding |  |  | Exercise Price |  |  | Contractual Life |
$5.76 |  |  | $10.72 |  |  |  | 101,075 |  |  | $ | 5.76 |  |  |  | 1.26 |
$10.73 |  |  | $11.40 |  |  |  | 41,389 |  |  |  | 10.84 |  |  |  | 0.77 |
$11.41 |  |  | $24.86 |  |  |  | 3,225 |  |  |  | 22.79 |  |  |  | 6.02 |
$24.87 |  |  | $49.91 |  |  |  | 6,750 |  |  |  | 47.83 |  |  |  | 8.37 |
|  |  |  |  |  |  | 152,439 |  |  | $ | 9.36 |  |  |  | 1.54 |
Exercisable: |  |  | Stock Options |  |  | Weighted-Average |
Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |
$5.76 |  |  | $10.72 |  |  |  | 66,377 |  |  | $ | 5.76 |
$10.73 |  |  | $11.40 |  |  |  | 41,389 |  |  |  | 10.84 |
$11.41 |  |  | $24.86 |  |  |  | 2,065 |  |  |  | 23.18 |
$24.87 |  |  | $49.91 |  |  |  | 750 |  |  |  | 49.49 |
|  |  |  |  |  |  | 110,581 |  |  | $ | 8.28 |
Schedule of valuation assumptions used for stock options | There were no grants of stock options during the nine months ended September 30, 2017.
|  | Nine Months Ended |  |  | Years Ended December 31, |
|  | September 30, 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility |  |  | n/a |  |  |  | 24.23 | % |  |  | 31.21 | %
Weighted-Average volatility |  |  | n/a |  |  |  | 24.23 | % |  |  | 31.21 | %
Expected dividends |  |  | — |  |  |  | — |  |  |  | — |
Expected term (in years) |  |  | n/a |  |  |  | 7.0 |  |  |  | 7.0 |
Risk-free rate |  |  | n/a |  |  |  | 1.37 | % |  |  | 1.64 | %
Weighted-average fair value (grant date) |  |  | n/a |  |  | $ | 14.27 |  |  | $ | 16.73

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