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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
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:
|  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Expected volatility |  |  | 41.63 | % |  |  | 43.95 | %
Expected dividends |  |  | 0.00 | % |  |  | 0.00 | %
Expected term (in years) |  |  | 5.99 |  |  |  | 5.96 |
Risk-free rate |  |  | 2.66 | % |  |  | 2.09 | %
Summary of Company's Stock Option Plan Activity | The following table summarizes the stock option activity for the six months ended June 30, 2018:
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, 2018 |  |  | 958 |  |  | $ | 17.39 |  |  |  |  |  |  |  |  |
Granted |  |  | 112 |  |  |  | 28.25 |  |  |  |  |  |  |  |  |
Exercised |  |  | (89 | ) |  |  | 16.62 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2018 |  |  | 981 |  |  | $ | 18.69 |  |  |  | 7.1 |  |  | $ | 16,007 |
Options exercisable at June 30, 2018 |  |  | 703 |  |  | $ | 17.03 |  |  |  | 6.5 |  |  | $ | 12,639 |
Summary of Additional Stock Option Information | The following table provides additional stock option information for the periods indicated:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
In thousands, except per share amounts |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted-average grant date fair value per share |  | $ | — |  |  | $ | 8.72 |  |  | $ | 12.39 |  |  | $ | 8.90 |
Intrinsic value of options exercised |  | $ | 574 |  |  | $ | 78 |  |  | $ | 1,604 |  |  | $ | 4,802 |
Fair value of stock options that vested |  | $ | — |  |  | $ | 258 |  |  | $ | 199 |  |  | $ | 559 |
Summary of RSU Activity | The following table summarizes RSU activity during the six months ended June 30, 2018:
In thousands, except per unit amounts |  | Units |  |  | Weighted-Average Grant Date Fair Value Per Unit |
Non-vested units at January 1, 2018 |  |  | 201 |  |  | $ | 17.33 |
Granted |  |  | 59 |  |  |  | 28.25 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (78 | ) |  |  | 14.92 |
Non-vested units at June 30, 2018 |  |  | 182 |  |  | $ | 21.89 |
Summary of Additional RSU Information | The following table provides additional RSU information for the periods indicated:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted-average grant date fair value per unit |  | $ | — |  |  | $ | — |  |  | $ | 28.25 |  |  | $ | 19.99 |
Summary of CSPU Activity | The following table summarizes CSPU activity during the six months ended June 30, 2018:
In thousands, except per unit amounts |  | Units |  |  | Weighted-Average Grant Date Fair Value Per Unit |
Non-vested units at January 1, 2018 |  |  | 3,484 |  |  | $ | 1.00 |
Granted |  |  | 1,660 |  |  |  | 1.00 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (1,162 | ) |  |  | 1.00 |
Non-vested units at June 30, 2018 |  |  | 3,982 |  |  | $ | 1.00 |
Summary of Restricted Stock Activity | The following table summarizes restricted stock activity during the six months ended June 30, 2018:
In thousands, except per share amounts |  | Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
Non-vested shares at January 1, 2018 |  |  | 53 |  |  | $ | 19.36 |
Granted |  |  | 98 |  |  |  | 24.70 |
Vested |  |  | (34 | ) |  |  | 21.09 |
Forfeited |  |  | — |  |  |  | — |
Non-vested shares at June 30, 2018 |  |  | 117 |  |  | $ | 23.33 |
Summary of Additional Restricted Stock Information | The following table provides additional restricted stock information:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
In thousands, except per share amounts |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted-average grant date fair value per share |  | $ | 34.39 |  |  | $ | 20.88 |  |  | $ | 24.70 |  |  | $ | 18.38 |
Fair value of restricted stock awards that vested |  | $ | 651 |  |  | $ | 345 |  |  | $ | 711 |  |  | $ | 390 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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