Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share

The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017:



	Year Ended December 31,
	2019	2018	2017
Weighted average number of shares outstanding used to calculate basic EPS	3,641	3,631	3,733
Dilutive securities:
Stock options and restricted share units	332	461	507
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	3,973	4,092	4,240

Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2019, 2018 and 2017, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.



	Year Ended December 31,
	2019	2018	2017
Anti-dilutive securities	319	370	15