Note 13. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share data).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Numerator:
Income from continuing operations	$	13,121	$	11,416	$	48,931	$	36,442
Denominator:
Basic
Weighted average common shares outstanding		54,594		53,968		54,334		53,632
Diluted
Stock options (1)		1,550		1,544		1,500		1,524
Restricted stock awards (1)		290		319		329		374
Contingent shares (2)		3		—		3		—
Diluted weighted average common shares outstanding		56,437		55,831		56,166		55,530
Basic earnings per share from continuing operations	$	0.24	$	0.21	$	0.90	$	0.68
Diluted earnings per share from continuing operations	$	0.23	$	0.20	$	0.87	$	0.66

(1)

A total of 0.4 million and 0.7 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2018, respectively, and a total of 0.5 million and 0.2 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2017, respectively, as their effect would be anti-dilutive.

(2)

Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future considerations have been met. Refer to Note 14, Acquisitions, for further details.