Stock options to purchase 993,500 shares of common stock and 326,200 shares of unvested restricted stock were excluded from the computation of diluted earnings per share during the three months ended March 31, 2019, as their effect would have been anti-dilutive. Stock options to purchase 583,500 shares of common stock were excluded from the computation of diluted earnings per share during the three months ended March 31, 2018, as their effect would have been anti-dilutive.