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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 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 June 30, 2017 and 2016.
|  | Six Months Ended June 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 |
|  | Six Months Ended June 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 |  |  | (1,366 | ) |  |  | 47.56 |  |  |  | (7,744 | ) |  |  | 40.12 |
Vested |  |  | (187,600 | ) |  |  | 30.07 |  |  |  | (195,738 | ) |  |  | 22.53 |
Unvested at end |  |  | 165,097 |  |  | $ | 53.56 |  |  |  | 270,386 |  |  | $ | 33.87 |
Schedule of activity of stock options | Below is a summary of stock option activity for the six months ended June 30, 2017 and 2016. The information excludes restricted stock units and awards.
|  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |
Beginning balance |  |  | 216,859 |  |  | $ | 8.80 |  |  |  | 298,740 |  |  | $ | 9.97 |
Issued |  |  | — |  |  |  | — |  |  |  | 1,500 |  |  |  | 49.91 |
Exercised |  |  | (64,090 | ) |  |  | 7.47 |  |  |  | (22,669 | ) |  |  | 12.82 |
Forfeited |  |  | — |  |  |  | — |  |  |  | (1,100 | ) |  |  | 15.48 |
Expired |  |  | — |  |  |  | — |  |  |  | (6,037 | ) |  |  | 13.57 |
Ending balance |  |  | 152,769 |  |  | $ | 9.36 |  |  |  | 270,434 |  |  | $ | 9.85 |
Schedule of stock option by exercise price range | The following summarizes information about stock options outstanding at June 30, 2017. The information excludes restricted stock units and awards.
Outstanding: Range of Exercise Prices |  |  | Stock Options Outstanding |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Life |
$ | 5.76 |  | $ | 10.72 |  |  | 101,405 |  |  | $ | 5.76 |  |  |  | 1.53 |
$ | 10.73 |  | $ | 11.40 |  |  | 41,389 |  |  |  | 10.84 |  |  |  | 1.02 |
$ | 11.41 |  | $ | 24.86 |  |  | 3,225 |  |  |  | 22.79 |  |  |  | 6.27 |
$ | 24.87 |  | $ | 49.91 |  |  | 6,750 |  |  |  | 47.83 |  |  |  | 8.62 |
|  |  |  |  |  |  | 152,769 |  |  | $ | 9.36 |  |  |  | 1.80 |
Exercisable: Range of Exercise Prices |  |  | Stock Options Exercisable |  |  | Weighted-Average Exercise Price |
$ | 5.76 |  | $ | 10.72 |  |  | 66,707 |  |  | $ | 5.76 |
$ | 10.73 |  | $ | 11.40 |  |  | 41,389 |  |  |  | 10.84 |
$ | 11.41 |  | $ | 24.86 |  |  | 1,565 |  |  |  | 22.64 |
$ | 24.87 |  | $ | 49.91 |  |  | 375 |  |  |  | 49.91 |
|  |  |  |  |  |  | 110,036 |  |  | $ | 8.06 |
Schedule of valuation assumptions used for stock options | The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option pricing model with the assumptions as shown in the table below used for grants during the years ended December 31, 2016 and 2015. There were no grants of stock options during the six months ended June 30, 2017.
|  | Six Months Ended June 30, 2017 |  |  | Years Ended December 31, |
|  |  |  | 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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