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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Option Grant Fair Value Assumptions | The fair value of option grants is estimated on the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions for option grants during the periods indicated below:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Expected volatility |  |  | 41.14 | % |  |  | 41.63 | %
Expected dividends |  |  | 0.00 | % |  |  | 0.00 | %
Expected term (in years) |  |  | 5.99 |  |  |  | 5.99 |
Risk-free rate |  |  | 2.55 | % |  |  | 2.66 | %
Summary of Company's Stock Option Plan Activity | The following table summarizes the stock option activity for the three months ended March 31, 2019:
In thousands, except per share amounts |  | Number of Shares |  |  | Weighted-Average Exercise Price Per Share |  |  | Weighted-Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2019 |  |  | 981 |  |  | $ | 18.69 |  |  |  |  |  |  |  |  |
Granted |  |  | 100 |  |  |  | 27.89 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options outstanding at March 31, 2019 |  |  | 1,081 |  |  | $ | 19.55 |  |  |  | 6.7 |  |  | $ | 6,294 |
Options exercisable at March 31, 2019 |  |  | 871 |  |  | $ | 17.83 |  |  |  | 6.1 |  |  | $ | 6,140 |
Summary of Additional Stock Option Information | The following table provides additional stock option information for the periods indicated:
|  | Three Months Ended March 31, |
In thousands, except per share amounts |  | 2019 |  |  | 2018 |
Weighted-average grant date fair value per share |  | $ | 12.07 |  |  | $ | 12.39 |
Intrinsic value of options exercised |  | $ | — |  |  | $ | 1,030 |
Fair value of stock options that vested |  | $ | — |  |  | $ | 199 |
Summary of RSU Activity | The following table summarizes RSU activity during the three months ended March 31, 2019:
In thousands, except per unit amounts |  | Units |  |  | Weighted-Average Grant Date Fair Value Per Unit |
Non-vested units at January 1, 2019 |  |  | 182 |  |  | $ | 21.89 |
Granted (target) |  |  | 39 |  |  |  | 27.89 |
Achieved performance adjustment (1) |  |  | 8 |  |  |  | 16.98 |
Vested |  |  | (54 | ) |  |  | 16.98 |
Forfeited |  |  | — |  |  |  | — |
Non-vested units at March 31, 2019 |  |  | 175 |  |  | $ | 24.55 |
| (1) | The 2016 LTIP RSUs were earned and vested at 116.5% of target, as described in greater detail in the Company’s definitive proxy statement filed with the SEC on March 27, 2019.
Summary of Additional RSU Information | The following table provides additional RSU information for the periods indicated:
In thousands, except per unit amounts |  | Three Months Ended March 31, |
| 2019 |  |  | 2018 |
Weighted-average grant date fair value per unit |  | $ | 27.89 |  |  | $ | 28.25 |
Fair value of RSUs that vested |  | $ | 916 |  |  | $ | — |
Summary of RSA Activity | The following table summarizes RSA activity during the three months ended March 31, 2019:
In thousands, except per share amounts |  | Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
Non-vested shares at January 1, 2019 |  |  | 71 |  |  | $ | 26.95 |
Granted |  |  | 107 |  |  |  | 27.58 |
Vested |  |  | (4 | ) |  |  | 24.19 |
Forfeited |  |  | — |  |  |  | — |
Non-vested shares at March 31, 2019 |  |  | 174 |  |  | $ | 27.41 |
Summary of Additional RSA Information | The following table provides additional RSA information for the periods indicated:
|  | Three Months Ended March 31, |
In thousands, except per share amounts |  | 2019 |  |  | 2018 |
Weighted-average grant date fair value per share |  | $ | 27.58 |  |  | $ | 20.56 |
Fair value of RSAs that vested |  | $ | 108 |  |  | $ | 60 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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