Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Our earnings per share (basic and diluted) are presented below (in thousands of dollars, except per share amounts):

	Quarter ended Mar. 31,
	2019		2018
Net income	$	73,979	$	55,187
Weighted average number of common shares outstanding - basic	216,709		216,276
Effect of dilutive securities:
Restricted stock units	179		177
Performance share units	256		216
Stock options	58		320
Weighted average number of common shares outstanding - diluted	217,202		216,989
Net income per share - basic	$	0.34	$	0.26
Net income per share - diluted	$	0.34	$	0.25