Basic earnings per share is computed by dividing net income by the weighted average number of shares of common stock outstanding. Diluted earnings per share is computed by dividing net income by the weighted average common and potentially dilutive common equivalent shares outstanding, determined as follows:



	Three Months Ended		Six Months Ended
	June 30,		June 30,
(In thousands)	2019	2018	2019	2018
Weighted average shares outstanding used to compute basic earnings per share	33,270	33,074	33,197	33,028
Incremental dilutive shares attributable to stock options and restricted stock	8	34	6	20
Shares used to compute diluted earnings per share	33,278	33,108	33,203	33,048

Incremental shares attributable to stock options and restricted stock are computed under the treasury stock method using the average market price during the related period. For the three and six months ended June 30, 2019, average out-of-the-money options to purchase shares that were excluded from the calculation of incremental shares attributable to stock options and restricted stock were 1,474,762 and 1,225,333, respectively. For the three and six months ended June 30, 2018, average out-of-the-money options to purchase shares that were excluded from the calculation of incremental shares attributable to stock options and restricted stock were 215,903 and 264,868, respectively.