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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of unvested restricted stock awards | The following tables summarize the unvested restricted stock awards activity for the three months ended March 31, 2018 and 2017.
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Perfomance Awards |  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested at beginning |  |  | 62,338 |  |  | $ | 50.45 |  |  |  | 33,226 |  |  | $ | 42.60 |
Issued |  |  | 42,533 |  |  |  | 60.45 |  |  |  | 36,523 |  |  |  | 57.49 |
Forfeited |  |  | (5,913 | ) |  |  | 50.28 |  |  |  | — |  |  |  | — |
Vested |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unvested at end |  |  | 98,958 |  |  | $ | 54.76 |  |  |  | 69,749 |  |  | $ | 50.40 |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Time Vested Awards |  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested at beginning |  |  | 164,043 |  |  | $ | 53.57 |  |  |  | 262,966 |  |  | $ | 33.60 |
Issued |  |  | 94,344 |  |  |  | 60.45 |  |  |  | 91,097 |  |  |  | 62.70 |
Forfeited |  |  | (5,165 | ) |  |  | 55.60 |  |  |  | (371 | ) |  |  | 42.93 |
Vested |  |  | (77,384 | ) |  |  | 49.67 |  |  |  | (176,134 | ) |  |  | 28.73 |
Unvested at end |  |  | 175,838 |  |  | $ | 58.92 |  |  |  | 177,558 |  |  | $ | 53.34 |
Schedule of activity of stock options | Below is a summary of stock option activity for the three months ended March 31, 2018 and 2017. The information excludes restricted stock units and awards.
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |
Beginning balance |  |  | 143,224 |  |  | $ | 9.13 |  |  |  | 216,859 |  |  | $ | 8.80 |
Issued |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (32,230 | ) |  |  | 10.48 |  |  |  | (2,675 | ) |  |  | 24.67 |
Forfeited |  |  | (500 | ) |  |  | 24.86 |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Ending balance |  |  | 110,494 |  |  | $ | 8.67 |  |  |  | 214,184 |  |  | $ | 8.60 |
Schedule of stock option by exercise price range | The following summarizes information about stock options outstanding at March 31, 2018. 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 |  |  |  |  | 97,995 |  |  | $ | 5.76 |  |  |  | 0.78 |
$10.73 |  |  |  | $11.40 |  |  |  |  | 5,089 |  |  |  | 11.17 |  |  |  | 3.63 |
$11.41 |  |  |  | $24.86 |  |  |  |  | 660 |  |  |  | 20.03 |  |  |  | 4.82 |
$24.87 |  |  |  | $49.91 |  |  |  |  | 6,750 |  |  |  | 47.83 |  |  |  | 7.87 |
|  |  |  |  |  |  |  |  | 110,494 |  |  | $ | 8.67 |  |  |  | 1.36 |
Exercisable: |  |  | Stock Options |  |  | Weighted-Average |
Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |
$5.76 |  |  |  | $10.72 |  |  |  |  | 80,646 |  |  | $ | 5.76 |
$10.73 |  |  |  | $11.40 |  |  |  |  | 5,089 |  |  |  | 11.17 |
$11.41 |  |  |  | $24.86 |  |  |  |  | 660 |  |  |  | 20.03 |
$24.87 |  |  |  | $49.91 |  |  |  |  | 2,000 |  |  |  | 47.62 |
|  |  |  |  |  |  |  |  | 88,395 |  |  | $ | 7.13 |
Schedule of valuation assumptions used for stock options | There were no grants of stock options during the three months ended March 31, 2018.
|  | Three Months Ended |  |  | Years Ended December 31, |
|  | March 31, 2018 |  |  | 2017 |  |  | 2016 |
Expected volatility |  |  | n/a |  |  |  | n/a |  |  |  | 24.23 | %
Weighted-Average volatility |  |  | n/a |  |  |  | n/a |  |  |  | 24.23 | %
Expected dividends |  |  | — |  |  |  | — |  |  |  | — |
Expected term (in years) |  |  | n/a |  |  |  | n/a |  |  |  | 7.0 |
Risk-free rate |  |  | n/a |  |  |  | n/a |  |  |  | 1.37 | %
Weighted-average fair value (grant date) |  |  | n/a |  |  |  | n/a |  |  | $ | 14.27 |

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