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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
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:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected volatility |  | 36% - 43% |  |  | 34% - 50% |  |  | 48% - 59% |
Weighted-average volatility |  |  | 39% |  |  |  | 43% |  |  |  | 55% |
Expected dividends |  |  | —% |  |  |  | —% |  |  |  | —% |
Expected term (in years) |  | .35 - 3.8 |  |  | 0.5 - 5.9 |  |  | 1.1 - 7.8 |
Risk-free rate |  | 0.54% - 1.11% |  |  | 0.26% - 1.73% |  |  | 0.14% - 2.37% |
Summary of Activity | The table below presents a summary of activity under the Plan, as of December 31, 2016, and changes during the year then ended:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2016 |  |  | 1,478,724 |  |  | $ | 6.16 |  |  |  |  |  |  |  |  |
Option grants |  |  | 315,000 |  |  |  | 7.66 |  |  |  |  |  |  |  |  |
Restricted stock unit grants |  |  | 828,344 |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised options |  |  | (1,032,174 | ) |  |  | 6.01 |  |  |  |  |  |  |  |  |
Cancelled or forfeited options |  |  | (238,700 | ) |  |  | 6.42 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,351,194 |  |  | $ | 2.76 |  |  |  | 6.0 |  |  | $ | 7,958,325 |
Exercisable options at December 31, 2016 |  |  | 121,950 |  |  | $ | 6.35 |  |  |  | 7.8 |  |  | $ | 280,553 |
Summary of Valuation Data | The table below presents our valuation data for the Plan:
(in thousands, except per share data) |  | 2016 |  |  | 2015 |  |  | 2014 |
Valuation Data: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value (per share) |  | $ | 4.92 |  |  | $ | 1.86 |  |  | $ | 2.98 |
Total stock-based compensation expense |  | $ | 674 |  |  | $ | 339 |  |  | $ | 280 |
Total income tax impact on provision |  | $ | 551 |  |  | $ | 281 |  |  | $ | 313 |

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- Definition Schedule of share based compensation valuation data. + References No definition available. + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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