13. Stockholders’ Equity

2012 Equity Incentive Plan

In May 2012, our stockholders approved our 2012 Equity Incentive Plan (the “2012 Plan”), which provides for the granting of incentive or non‑qualified stock options, stock appreciation rights, restricted or deferred stock, dividend equivalents or other incentive awards to directors, employees, or consultants. The number of shares authorized and reserved for issuance under the 2012 Plan is 5.1 million shares. As of December 31, 2016, there were 3.2 million shares available for issuance under this plan. The 2012 Plan will expire in May 2022. Additionally, we have outstanding stock options, stock awards and stock units that were issued under other plans, and no further grants may be made under those plans.

Share Repurchase Program

On March 29, 2007, our Board of Directors (the “Board”) approved a stock repurchase program to acquire up to 1.0 million shares of our outstanding common stock. Subsequently, the Board has from time to time approved extensions of the program to acquire additional shares. On August 11, 2016, the Board approved an extension to the program by increasing the shares authorized for repurchase by 0.6 million shares. Since the inception of the repurchase program, the Board has approved 8.1 million shares to be repurchased. As of December 31, 2016, we have repurchased a cumulative total of 7.3 million shares at an average price of $13.02 per share under the repurchase program.

The share repurchases will be made from time to time at our discretion in the open market or privately negotiated transactions as permitted by securities laws and other legal requirements, and subject to market conditions and other factors. The Board may modify, suspend, extend or terminate the program at any time. During the twelve months ended December 31, 2016, we repurchased 0.5 million shares for approximately $13.1 million at an average price of $28.44 per share.

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of shares of common stock outstanding during the year. Diluted EPS is computed considering the dilutive effect of stock options, restricted stock, restricted stock units and performance stock units. The vesting of unvested contingently issuable performance stock units is based on the achievement of certain earnings per share targets and total shareholder return. These shares are considered contingently issuable shares for purposes of calculating diluted earnings per share. These shares are not included in the diluted earnings per share denominator until the performance criteria are met, if it is assumed that the end of the reporting period was the end of the contingency period.

Unvested restricted stock, restricted stock units and performance stock units are included in diluted earnings per share, weighted outstanding until the shares and units vest. Upon vesting, the vested restricted stock, restricted stock units and performance stock units are included in basic earnings per share weighted outstanding from the vesting date.

There were approximately 0.1 million anti-dilutive stock options excluded from the calculation of diluted EPS for the year ended December 31, 2016. There were no anti-dilutive stock options for the year ended December 31, 2015. There were approximately 0.2 million anti-dilutive stock options excluded from the calculation of diluted EPS for the year ended December 31, 2014.

The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):



	Year Ended December 31,
	2016	2015	2014
Common shares outstanding, end of period	37,209	37,427	37,270
Effect of using weighted average common shares outstanding	126	15	277
Shares used in computing earnings per share—basic	37,335	37,442	37,547
Effect of shares issuable under stock option plans based on the treasury stock method	330	266	147
Effect of restricted and contingently issuable shares	146	160	103
Shares used in computing earnings per share—diluted	37,811	37,868	37,797