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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Option Grant Fair Value Assumptions | The fair value of option grants are 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:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility |  |  | 43.95 | % |  |  | 46.04 | % |  |  | 47.15 | %
Expected dividends |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Expected term (in years) |  |  | 5.96 |  |  |  | 5.80 |  |  |  | 6.15 |
Risk-free rate |  |  | 2.09 | % |  |  | 1.32 | % |  |  | 1.62 | %
Summary of Company's Stock Option Plan Activity | The following table summarizes the stock option activity for the year ended December 31, 2017:
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, 2017 |  |  | 1,166 |  |  | $ | 14.66 |  |  |  |  |  |  |  |  |
Granted |  |  | 116 |  |  |  | 19.99 |  |  |  |  |  |  |  |  |
Exercised |  |  | (289 | ) |  |  | 7.35 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (35 | ) |  |  | 18.30 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2017 |  |  | 958 |  |  | $ | 17.39 |  |  |  | 7.1 |  |  | $ | 8,747 |
Options exercisable at December 31, 2017 |  |  | 771 |  |  | $ | 16.99 |  |  |  | 6.8 |  |  | $ | 7,351 |
Available for grant at December 31, 2017 |  |  | 1,275 |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Additional Stock Option Information | The following table provides additional stock option information for the periods indicated:
|  | Year Ended December 31, |
In thousands, except per share amounts |  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average grant date fair value per share |  | $ | 8.90 |  |  | $ | 7.74 |  |  | $ | 7.13 |
Intrinsic value of options exercised |  | $ | 4,981 |  |  | $ | 1,397 |  |  | $ | 1,524 |
Fair value of stock options that vested |  | $ | 3,004 |  |  | $ | 2,131 |  |  | $ | 1,207 |
Summary of RSU Activity | The following table summarizes RSU activity during the year ended December 31, 2017:
In thousands, except per unit amounts |  | Units |  |  | Weighted-Average Grant Date Fair Value Per Unit |
Non-vested units at January 1, 2017 |  |  | 164 |  |  | $ | 16.07 |
Granted |  |  | 85 |  |  |  | 19.99 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (48 | ) |  |  | 17.69 |
Non-vested units at December 31, 2017 |  |  | 201 |  |  | $ | 17.33 |
Summary of Additional RSU Information | The following table provides additional RSU information for the periods indicated:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average grant date fair value per unit |  | $ | 19.99 |  |  | $ | 17.02 |  |  | $ | 14.89 |
Summary of CSPU Activity | The following table summarizes CSPU activity during the year ended December 31, 2017:
In thousands, except per unit amounts |  | Units |  |  | Weighted-Average Grant Date Fair Value Per Unit |
Non-vested units at January 1, 2017 |  |  | 2,641 |  |  | $ | 1.00 |
Granted |  |  | 1,686 |  |  |  | 1.00 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (843 | ) |  |  | 1.00 |
Non-vested units at December 31, 2017 |  |  | 3,484 |  |  | $ | 1.00 |
Summary of Restricted Stock Activity | The following table summarizes restricted stock activity during the year ended December 31, 2017:
In thousands, except per share amounts |  | Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
Non-vested shares at January 1, 2017 |  |  | 39 |  |  | $ | 16.46 |
Granted |  |  | 83 |  |  |  | 18.38 |
Vested |  |  | (60 | ) |  |  | 16.30 |
Forfeited |  |  | (9 | ) |  |  | 18.25 |
Non-vested shares at December 31, 2017 |  |  | 53 |  |  | $ | 19.36 |
Summary of Additional Restricted Stock Information | The following table provides additional restricted stock information.
|  | Year Ended December 31, |
In thousands, except per share amounts |  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average grant date fair value per share |  | $ | 18.38 |  |  | $ | 16.37 |  |  | $ | 15.36 |
Fair value of restricted stock awards that vested |  | $ | 983 |  |  | $ | 347 |  |  | $ | 2,198 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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