Basic earnings per share is calculated using the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is computed in the same manner and also gives effect to all dilutive common stock equivalent shares outstanding during the period. Potential common shares that would have the effect of increasing diluted earnings per share are considered to be anti-dilutive. In accordance with U.S. GAAP, these shares were not included in calculating diluted earnings per share.

For the year ended December 31, 2019, the weighted average number of restricted stock units and stock options excluded from the computation of diluted earnings per share were 69 and 0, respectively. For the year ended December 31, 2018, the weighted average number of restricted stock units and stock options excluded from the computation of diluted earnings per share were 52 and 0, respectively. For the year ended December 31, 2017, the weighted average number of restricted stock units and stock options excluded from the computation of diluted earnings per share were 8 and 0, respectively.

	December 31,
	2019		2018		2017
Numerator:
Net income	$	1,910	$	45,096	$	32,909
Denominator:
Basic earnings per share - weighted average shares outstanding		29,729		25,470		25,325
Effect of potential dilutive securities:
Restricted stock units and stock options - dilutive shares		278		426		539
Warrants - dilutive shares		—		—		1
Diluted earnings per share - weighted average shares outstanding		30,007		25,895		25,865
Earnings per share:
Basic	$	0.06	$	1.77	$	1.30
Diluted	$	0.06	$	1.74	$	1.27