Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

8. Earnings Per Share

Basic earnings per share is computed in accordance with ASC 260, Earnings per Share, based on weighted average outstanding common shares. Diluted earnings per share is computed based on basic weighted average outstanding common shares adjusted for the dilutive effect of stock options and RSUs.

The following table reconciles the weighted average share amounts used to compute both basic and diluted earnings per share (in thousands):

	Years Ended December 31,
	2018		2017		2016
Weighted average shares outstanding:
Basic weighted average shares outstanding		116,057		118,059		117,533
Add: Dilutive effect of stock options and RSUs		1,575		1,385		1,314
Diluted weighted average shares outstanding		117,632		119,444		118,847

The diluted earnings per share computation excludes 2.2 million, 3.9 million, and 6.1 million options to purchase shares and contingently issuable shares during the years ended December 31, 2018, 2017, and 2016, respectively, as their effect would be anti-dilutive.

Common stock outstanding as of December 31, 2018 and 2017, was 116,123,361 and 117,096,731, respectively.