Net Income Per Share

3 Months Ended

Mar. 31, 2019

Basic net income per share is calculated as net income divided by the weighted average number of shares outstanding. Diluted net income per share is calculated as net income divided by the weighted average number of shares outstanding plus the incremental number of shares added as a result of converting common stock equivalents, calculated using the treasury stock method. The Corporation’s common stock equivalents consist of outstanding stock options, restricted stock units ("RSUs") and performance-based restricted stock units ("PSUs"). PSUs are required to be included in weighted average shares outstanding if performance measures, as defined in each PSU award agreement, are met as of the end of the period.

A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows (in thousands, except per share data):



	Three months ended March 31
	2019	2018
Weighted average shares outstanding (basic)	169,884	175,303
Impact of common stock equivalents	1,025	1,265
Weighted average shares outstanding (diluted)	170,909	176,568
Per share:
Basic	0.33	0.28
Diluted	0.33	0.28