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Common Stock | 12 Months Ended
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Dec. 31, 2017
Common Stock. |
Common Stock | (12) Common Stock The Class A common stock and Class B common stock have equal dividend and liquidation rights. Each share of the Company’s Class A common stock is entitled to one vote on all matters submitted to stockholders, and each share of Class B common stock is entitled to ten votes on all such matters. Shares of Class B common stock are convertible into shares of Class A common stock on a one‑to‑one basis at the option of the holder. As of December 31, 2017, the Company had reserved a total of 2,673,034 shares of Class A common stock for issuance under its stock‑based compensation plans and 6,379,290 shares for conversion of Class B common stock to Class A common stock. On July 27, 2015, the Company’s Board of Directors authorized the repurchase of up to $100 million of the Company’s Class A common stock from time to time on the open market or in privately negotiated transactions. In connection with this stock repurchase program, the Company entered into a Rule 10b5-1 plan, which permits shares to be repurchased when the Company might otherwise be precluded from doing so under insider trading laws. The repurchase program may be suspended or discontinued at any time, subject to the terms of the Rule 10b5-1 plan the Company entered into with respect to the repurchase program. As of December 31, 2017, there was approximately $37.8 million remaining authorized for share repurchases under this program. The following table summarizes the cost and the number of shares of Class A common stock repurchased under the July 27, 2015 programs for the years ended December 31, 2017 and 2016:
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |
|  | Number of shares |  | Cost of shares |  | Number of shares |  | Cost of shares |
|  | repurchased |  | repurchased |  | repurchased |  | repurchased |
|  | (amounts in millions, except share amount) |
Stock repurchase programs: |  |  |  |  |  |  |  |  |  |  |
July 27, 2015 |  | 277,886 |  |  | 18.2 |  | 501,229 |  |  | 26.8 |
Total |  | 277,886 |  | $ | 18.2 |  | 501,229 |  | $ | 26.8 |

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