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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Variables Used in Black-Scholes Option Pricing Model to Determine Estimated Grant Date Fair Value for Options Granted | The following are the variables we used in the Black-Scholes option pricing model to determine the estimated grant date fair value for options granted under the Plan for each of the years presented:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility |  | 38% - 41% |  |  | 36% - 43% |  |  | 34% - 50% |
Weighted-average volatility |  | 38% |  |  | 39% |  |  | 43% |
Expected dividends |  | —% |  |  | —% |  |  | —% |
Expected term (in years) |  | 3.2 - 3.5 |  |  | .35 - 3.8 |  |  | 0.5 - 5.9 |
Risk-free rate |  | 1.45% - 1.99% |  |  | 0.54% - 1.11% |  |  | 0.26% - 1.73% |
Summary of Activity | The table below presents a summary of activity under the Plan, as of December 31, 2017, and changes during the year then ended:
(in thousands, except share and per share amounts) |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 1,351,194 |  |  | $ | 7.13 |  |  |  |  |  |  |  |  |
Option grants |  |  | 76,950 |  |  |  | 5.82 |  |  |  |  |  |  |  |  |
Restricted stock unit grants |  |  | 70,705 |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised options |  |  | (15,000 | ) |  |  | 5.61 |  |  |  |  |  |  |  |  |
Cancelled or forfeited options |  |  | (17,700 | ) |  |  | 3.21 |  |  |  |  |  |  |  |  |
Cancelled or forfeited restricted stock units |  |  | (29,801 | ) |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 1,436,348 |  |  | $ | 7.67 |  |  |  | 5.2 |  |  | $ | 13,459 |
Exercisable options at December 31, 2017 |  |  | 209,150 |  |  | $ | 6.70 |  |  |  | 6.9 |  |  | $ | 1,192 |
Summary of Valuation Data | The table below presents our valuation data for the Plan:
(in thousands, except per share amounts) |  | 2017 |  |  | 2016 |  |  | 2015 |
Valuation Data: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value (per share) |  | $ | 7.68 |  |  | $ | 4.92 |  |  | $ | 1.86 |
Total stock-based compensation expense |  | $ | 1,833 |  |  | $ | 674 |  |  | $ | 339 |
Total income tax impact on provision |  | $ | 585 |  |  | $ | 551 |  |  | $ | 281 |

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- Definition Tabular disclosure for share-based compensation 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 (c)(2) -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 (d) -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 (e) -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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