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Stock Incentive Plans | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Incentive Plans | Note 10 - Stock Incentive Plans The Company's 2015 Stock Incentive Plan (the "2015 Plan"), which provides for share-based awards to Company employees, non-employee directors and outside consultants or advisors, was approved by stockholders on May 27, 2015. The number of shares of common stock reserved for issuance under the 2015 Plan is 1,000,000, of which the maximum number of shares for which incentive stock options may be granted is 900,000. The 2015 Plan replaced the Company’s 2009 Stock Incentive Plan (the “2009 Plan”), and no new share-based awards may be granted under the 2009 Plan. The number of shares available for grant at December 31, 2018 is 506,295. Outstanding option awards under all the plans generally expire ten years after the date of grant. Share-based compensation expense included in selling, general and administrative expenses during the years ended December 31, 2018, 2017 and 2016, was $5.5 million, $4.2 million and $2.8 million, respectively. Related income tax benefits for the years ended December 31, 2018, 2017 and 2016, were $1.5 million, $1.5 million and $1.1 million, respectively. Stock Options Stock options are generally exercisable in four equal annual installments beginning one year following the date of grant. A summary of the status of the Company’s stock options at December 31, 2018, together with changes during the periods then ended, is presented below:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  | Aggregate |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Intrinsic |
|  | Number |  |  | Exercise |  |  | Contractual |  |  | Value |
|  | of Options |  |  | Price |  |  | Term (Years) |  |  | (In Thousands) |
Outstanding at December 31, 2017 |  |  | 292,400 |  |  | $ | 17.99 |  |  |  | — |  |  |  | — |
Options granted at market price |  |  | 120,000 |  |  |  | 82.21 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (40,140 | ) |  |  | 14.39 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2018 |  |  | 372,260 |  |  |  | 39.08 |  |  |  | 4.86 |  |  |  | 9,759 |
Exercisable at December 31, 2018 |  |  | 219,135 |  |  |  | 17.73 |  |  |  | 2.56 |  |  | $ | 8,661 |
The fair value of stock option awards as determined under the Black-Scholes option-pricing model was estimated with the following weighted-average assumptions:
|  | 2018 |  | 2016 |  |
Expected volatility |  |  | 42.2 | % |  | 55.2 |  | %
Risk free interest rate |  |  | 2.7 | % |  | 1.2 |  | %
Expected dividend yield |  |  | 1.2 | % |  | 2.2 |  | %
Expected term |  |  | 8.3 years |  |  | 6.2 years |  |
Weighted average fair value per share |  | $ | 36.41 |  | $ |  | 17.10 |  |
The weighted average fair value of stock options granted for the years ended December 31, 2018 and 2016 was $36.41 and $17.10, respectively. There were no stock options granted with an exercise price below market price during 2018 and 2016. No stock options were granted during 2017. The intrinsic value of stock options exercised for the years ended December 31, 2018, 2017 and 2016 was $2.5 million, $479,000 and $113,000, respectively. The fair value of stock options vested for the years ended December 31, 2018, 2017 and 2016 was $312,000, $328,000 and $319,000, respectively. As of December 31, 2018, unrecognized compensation expense related to stock options was $4.3 million with a weighted average remaining amortization period of 7.1 years. Restricted Stock Units Restricted stock units generally vest in four equal annual installments beginning one year following the date of grant. The following table presents restricted stock unit activity:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Units |  |  | Fair Value |
Nonvested at December 31, 2017 |  |  | 234,383 |  |  | $ | 47.26 |
Granted |  |  | 55,352 |  |  |  | 96.31 |
Vested |  |  | (53,938 | ) |  |  | 46.56 |
Cancelled/Forfeited |  |  | (31,943 | ) |  |  | 46.20 |
Nonvested at December 31, 2018 |  |  | 203,854 |  |  | $ | 60.93 |
The total fair value of restricted stock units vested during the years ended December 31, 2018, 2017 and 2016 was $4.0 million, $3.3 million and $1.9 million, respectively. As of December 31, 2018, unrecognized compensation expense related to restricted stock units was $10.1 million with a weighted average remaining amortization period of 2.6 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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