6.	Capital Stock

Net income per share

Net income per share is computed based on the weighted-average number of common shares outstanding during the periods presented. Additionally, diluted earnings per share data gives effect to all potentially dilutive common shares that were outstanding during the periods presented. For the three-month periods ended March 31, 2019 and 2018, stock options of 1.0 million and 0.9 million, respectively, were excluded from the calculation of diluted earnings per share because they were anti-dilutive.

Dividends

In February 2019, the Company’s board of directors declared a quarterly cash dividend of $0.37 per share. This quarterly cash dividend of $20.5 million was paid on March 13, 2019 to stockholders of record on February 25, 2019. In April 2019, the board of directors declared a quarterly cash dividend of $0.37 per share to be paid on June 12, 2019 to shareholders of record on May 31, 2019.

Repurchase of common stock

During the three-month periods ended March 31, 2019 and 2018, the Company repurchased approximately 14,000 shares and 0.2 million shares of its Class A common stock under its open market stock repurchase plans for $0.8 million and $17.4 million, respectively. As of March 31, 2019, $470.2 million was available for repurchases under the Company’s open market stock repurchase plan.